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Publisher: Springer-Verlag   (Total: 2341 journals)

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Showing 1 - 200 of 2341 Journals sorted alphabetically
3D Research     Hybrid Journal   (Followers: 19, SJR: 0.214, h-index: 10)
4OR: A Quarterly J. of Operations Research     Hybrid Journal   (Followers: 9, SJR: 1.073, h-index: 25)
AAPS J.     Hybrid Journal   (Followers: 17, SJR: 1.192, h-index: 74)
AAPS PharmSciTech     Hybrid Journal   (Followers: 6, SJR: 0.718, h-index: 54)
Abdominal Imaging     Hybrid Journal   (Followers: 16, SJR: 0.723, h-index: 60)
Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg     Hybrid Journal   (Followers: 2, SJR: 0.447, h-index: 12)
Academic Psychiatry     Full-text available via subscription   (Followers: 22, SJR: 0.492, h-index: 32)
Academic Questions     Hybrid Journal   (Followers: 7, SJR: 0.135, h-index: 6)
Accreditation and Quality Assurance: J. for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 26, SJR: 0.378, h-index: 30)
Acoustical Physics     Hybrid Journal   (Followers: 10, SJR: 0.355, h-index: 20)
Acoustics Australia     Hybrid Journal  
Acta Analytica     Hybrid Journal   (Followers: 7, SJR: 0.387, h-index: 6)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 1, SJR: 0.624, h-index: 34)
Acta Biotheoretica     Hybrid Journal   (Followers: 5, SJR: 0.419, h-index: 25)
Acta Diabetologica     Hybrid Journal   (Followers: 12, SJR: 1.318, h-index: 46)
Acta Endoscopica     Hybrid Journal   (Followers: 1, SJR: 0.113, h-index: 8)
acta ethologica     Hybrid Journal   (Followers: 4, SJR: 0.465, h-index: 23)
Acta Geochimica     Hybrid Journal   (Followers: 3)
Acta Geodaetica et Geophysica     Hybrid Journal   (Followers: 1, SJR: 0.294, h-index: 13)
Acta Geotechnica     Hybrid Journal   (Followers: 6, SJR: 1.818, h-index: 22)
Acta Informatica     Hybrid Journal   (Followers: 5, SJR: 0.524, h-index: 32)
Acta Mathematica     Hybrid Journal   (Followers: 10, SJR: 8.021, h-index: 47)
Acta Mathematica Hungarica     Hybrid Journal   (Followers: 2, SJR: 0.53, h-index: 29)
Acta Mathematica Sinica, English Series     Hybrid Journal   (Followers: 5, SJR: 0.406, h-index: 30)
Acta Mathematica Vietnamica     Hybrid Journal   (SJR: 0.451, h-index: 5)
Acta Mathematicae Applicatae Sinica, English Series     Hybrid Journal   (SJR: 0.22, h-index: 20)
Acta Mechanica     Hybrid Journal   (Followers: 18, SJR: 0.898, h-index: 52)
Acta Mechanica Sinica     Hybrid Journal   (Followers: 4, SJR: 0.426, h-index: 29)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5, SJR: 0.525, h-index: 18)
Acta Meteorologica Sinica     Hybrid Journal   (Followers: 3, SJR: 0.524, h-index: 14)
Acta Neurochirurgica     Hybrid Journal   (Followers: 6, SJR: 0.833, h-index: 73)
Acta Neurologica Belgica     Hybrid Journal   (SJR: 0.348, h-index: 27)
Acta Neuropathologica     Hybrid Journal   (Followers: 3, SJR: 6.61, h-index: 117)
Acta Oceanologica Sinica     Hybrid Journal   (Followers: 3, SJR: 0.295, h-index: 17)
Acta Parasitologica     Hybrid Journal   (Followers: 9, SJR: 0.581, h-index: 28)
Acta Physiologiae Plantarum     Hybrid Journal   (Followers: 2, SJR: 0.551, h-index: 39)
Acta Politica     Hybrid Journal   (Followers: 13, SJR: 0.658, h-index: 20)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 5, SJR: 0.103, h-index: 4)
ADHD Attention Deficit and Hyperactivity Disorders     Hybrid Journal   (Followers: 20, SJR: 0.871, h-index: 15)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 7)
Administration and Policy in Mental Health and Mental Health Services Research     Partially Free   (Followers: 14, SJR: 0.795, h-index: 40)
Adsorption     Hybrid Journal   (Followers: 4, SJR: 0.774, h-index: 52)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 3, SJR: 0.319, h-index: 15)
Advances in Atmospheric Sciences     Hybrid Journal   (Followers: 34, SJR: 0.959, h-index: 44)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 15, SJR: 1.255, h-index: 44)
Advances in Contraception     Hybrid Journal   (Followers: 2)
Advances in Data Analysis and Classification     Hybrid Journal   (Followers: 52, SJR: 1.113, h-index: 14)
Advances in Gerontology     Partially Free   (Followers: 8, SJR: 0.141, h-index: 3)
Advances in Health Sciences Education     Hybrid Journal   (Followers: 23, SJR: 1.397, h-index: 42)
Advances in Manufacturing     Hybrid Journal   (Followers: 3, SJR: 0.2, h-index: 4)
Advances in Polymer Science     Hybrid Journal   (Followers: 40, SJR: 0.637, h-index: 89)
Advances in Therapy     Hybrid Journal   (Followers: 5, SJR: 0.79, h-index: 44)
Aegean Review of the Law of the Sea and Maritime Law     Hybrid Journal   (Followers: 7)
Aequationes Mathematicae     Hybrid Journal   (Followers: 2, SJR: 0.882, h-index: 23)
Aerobiologia     Hybrid Journal   (Followers: 1, SJR: 0.511, h-index: 36)
Aesthetic Plastic Surgery     Hybrid Journal   (Followers: 8, SJR: 0.821, h-index: 49)
African Archaeological Review     Hybrid Journal   (Followers: 14, SJR: 0.612, h-index: 24)
Afrika Matematika     Hybrid Journal   (Followers: 1, SJR: 0.248, h-index: 6)
AGE     Hybrid Journal   (Followers: 7, SJR: 1.358, h-index: 33)
Ageing Intl.     Hybrid Journal   (Followers: 7, SJR: 0.337, h-index: 10)
Aggiornamenti CIO     Hybrid Journal   (Followers: 1)
Aging Clinical and Experimental Research     Hybrid Journal   (Followers: 3, SJR: 0.529, h-index: 55)
Agricultural Research     Hybrid Journal   (Followers: 3)
Agriculture and Human Values     Hybrid Journal   (Followers: 12, SJR: 1.197, h-index: 49)
Agroforestry Systems     Hybrid Journal   (Followers: 20, SJR: 0.64, h-index: 56)
Agronomy for Sustainable Development     Hybrid Journal   (Followers: 10, SJR: 1.732, h-index: 59)
AI & Society     Hybrid Journal   (Followers: 7, SJR: 0.171, h-index: 19)
AIDS and Behavior     Hybrid Journal   (Followers: 13, SJR: 2.006, h-index: 71)
Air Quality, Atmosphere & Health     Hybrid Journal   (Followers: 2, SJR: 0.706, h-index: 19)
Akupunktur & Aurikulomedizin     Full-text available via subscription   (Followers: 1)
Algebra and Logic     Hybrid Journal   (Followers: 2, SJR: 0.566, h-index: 18)
Algebra Universalis     Hybrid Journal   (Followers: 2, SJR: 0.388, h-index: 22)
Algebras and Representation Theory     Hybrid Journal   (Followers: 1, SJR: 0.868, h-index: 20)
Algorithmica     Hybrid Journal   (Followers: 7, SJR: 0.898, h-index: 56)
Allergo J.     Full-text available via subscription   (Followers: 1, SJR: 0.183, h-index: 20)
Allergo J. Intl.     Hybrid Journal   (Followers: 2)
Alpine Botany     Hybrid Journal   (Followers: 3, SJR: 0.729, h-index: 20)
ALTEX : Alternatives to Animal Experimentation     Open Access   (Followers: 3, SJR: 1.392, h-index: 32)
AMBIO     Hybrid Journal   (Followers: 14, SJR: 1.094, h-index: 87)
American J. of Cardiovascular Drugs     Hybrid Journal   (Followers: 10, SJR: 0.864, h-index: 39)
American J. of Community Psychology     Hybrid Journal   (Followers: 24, SJR: 1.237, h-index: 83)
American J. of Criminal Justice     Hybrid Journal   (Followers: 5, SJR: 0.634, h-index: 13)
American J. of Cultural Sociology     Hybrid Journal   (Followers: 11, SJR: 0.283, h-index: 3)
American J. of Dance Therapy     Hybrid Journal   (Followers: 4, SJR: 0.175, h-index: 13)
American J. of Potato Research     Hybrid Journal   (Followers: 2, SJR: 0.558, h-index: 35)
American J. of Psychoanalysis     Hybrid Journal   (Followers: 21, SJR: 0.293, h-index: 13)
American Sociologist     Hybrid Journal   (Followers: 11, SJR: 0.18, h-index: 13)
Amino Acids     Hybrid Journal   (Followers: 7, SJR: 1.362, h-index: 83)
AMS Review     Partially Free   (Followers: 4)
Analog Integrated Circuits and Signal Processing     Hybrid Journal   (Followers: 5, SJR: 0.21, h-index: 37)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 4, SJR: 0.665, h-index: 7)
Analysis in Theory and Applications     Hybrid Journal  
Analysis of Verbal Behavior     Hybrid Journal   (Followers: 4)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 28, SJR: 1.096, h-index: 123)
Anatomical Science Intl.     Hybrid Journal   (Followers: 2, SJR: 0.301, h-index: 26)
Angewandte Schmerztherapie und Palliativmedizin     Hybrid Journal  
Angiogenesis     Hybrid Journal   (Followers: 3, SJR: 2.212, h-index: 69)
Animal Cognition     Hybrid Journal   (Followers: 14, SJR: 1.122, h-index: 55)
Annales françaises de médecine d'urgence     Hybrid Journal   (Followers: 1, SJR: 0.156, h-index: 4)
Annales Henri Poincaré     Hybrid Journal   (Followers: 3, SJR: 1.377, h-index: 32)
Annales mathématiques du Québec     Hybrid Journal   (Followers: 4)
Annali dell'Universita di Ferrara     Hybrid Journal   (SJR: 0.504, h-index: 14)
Annali di Matematica Pura ed Applicata     Hybrid Journal   (Followers: 1, SJR: 1.167, h-index: 26)
Annals of Behavioral Medicine     Hybrid Journal   (Followers: 11, SJR: 2.112, h-index: 98)
Annals of Biomedical Engineering     Hybrid Journal   (Followers: 18, SJR: 1.182, h-index: 94)
Annals of Combinatorics     Hybrid Journal   (Followers: 3, SJR: 0.849, h-index: 15)
Annals of Data Science     Hybrid Journal   (Followers: 8)
Annals of Dyslexia     Hybrid Journal   (Followers: 9, SJR: 0.857, h-index: 40)
Annals of Finance     Hybrid Journal   (Followers: 27, SJR: 0.686, h-index: 14)
Annals of Forest Science     Hybrid Journal   (Followers: 4, SJR: 0.929, h-index: 57)
Annals of Global Analysis and Geometry     Hybrid Journal   (Followers: 1, SJR: 1.136, h-index: 23)
Annals of Hematology     Hybrid Journal   (Followers: 13, SJR: 1.117, h-index: 62)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 6, SJR: 0.593, h-index: 42)
Annals of Microbiology     Hybrid Journal   (Followers: 9, SJR: 0.402, h-index: 26)
Annals of Nuclear Medicine     Hybrid Journal   (Followers: 5, SJR: 0.68, h-index: 45)
Annals of Operations Research     Hybrid Journal   (Followers: 8, SJR: 1.186, h-index: 78)
Annals of Regional Science     Hybrid Journal   (Followers: 7, SJR: 0.405, h-index: 42)
Annals of Software Engineering     Hybrid Journal   (Followers: 12)
Annals of Solid and Structural Mechanics     Hybrid Journal   (Followers: 9, SJR: 0.553, h-index: 8)
Annals of Surgical Oncology     Hybrid Journal   (Followers: 11, SJR: 1.902, h-index: 127)
Annals of Telecommunications     Hybrid Journal   (Followers: 7, SJR: 0.315, h-index: 25)
Annals of the Institute of Statistical Mathematics     Hybrid Journal   (Followers: 1, SJR: 0.931, h-index: 31)
Antonie van Leeuwenhoek     Hybrid Journal   (Followers: 5, SJR: 0.992, h-index: 87)
Apidologie     Hybrid Journal   (Followers: 4, SJR: 1.14, h-index: 57)
APOPTOSIS     Hybrid Journal   (Followers: 7, SJR: 1.554, h-index: 87)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2, SJR: 0.354, h-index: 27)
Applications of Mathematics     Hybrid Journal   (Followers: 1, SJR: 0.274, h-index: 20)
Applied Biochemistry and Biotechnology     Hybrid Journal   (Followers: 44, SJR: 0.575, h-index: 80)
Applied Biochemistry and Microbiology     Hybrid Journal   (Followers: 17, SJR: 0.267, h-index: 26)
Applied Categorical Structures     Hybrid Journal   (Followers: 2, SJR: 0.361, h-index: 21)
Applied Composite Materials     Hybrid Journal   (Followers: 45, SJR: 0.705, h-index: 35)
Applied Entomology and Zoology     Partially Free   (Followers: 2, SJR: 0.554, h-index: 34)
Applied Geomatics     Hybrid Journal   (Followers: 3, SJR: 0.323, h-index: 9)
Applied Geophysics     Hybrid Journal   (Followers: 7, SJR: 0.541, h-index: 13)
Applied Intelligence     Hybrid Journal   (Followers: 14, SJR: 0.777, h-index: 43)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 3, SJR: 0.358, h-index: 34)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 4, SJR: 0.955, h-index: 33)
Applied Mathematics - A J. of Chinese Universities     Hybrid Journal   (SJR: 0.275, h-index: 8)
Applied Mathematics and Mechanics     Hybrid Journal   (Followers: 4, SJR: 0.37, h-index: 26)
Applied Microbiology and Biotechnology     Hybrid Journal   (Followers: 61, SJR: 1.262, h-index: 161)
Applied Physics A     Hybrid Journal   (Followers: 7, SJR: 0.535, h-index: 121)
Applied Physics B: Lasers and Optics     Hybrid Journal   (Followers: 23, SJR: 0.983, h-index: 104)
Applied Psychophysiology and Biofeedback     Hybrid Journal   (Followers: 6, SJR: 0.677, h-index: 47)
Applied Research in Quality of Life     Hybrid Journal   (Followers: 10, SJR: 0.288, h-index: 15)
Applied Solar Energy     Hybrid Journal   (Followers: 15, SJR: 0.251, h-index: 6)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4, SJR: 0.351, h-index: 9)
Aquaculture Intl.     Hybrid Journal   (Followers: 21, SJR: 0.613, h-index: 40)
Aquarium Sciences and Conservation     Hybrid Journal   (Followers: 1)
Aquatic Ecology     Hybrid Journal   (Followers: 30, SJR: 0.646, h-index: 44)
Aquatic Geochemistry     Hybrid Journal   (Followers: 3, SJR: 0.764, h-index: 39)
Aquatic Sciences     Hybrid Journal   (Followers: 12, SJR: 1.172, h-index: 53)
Arabian J. for Science and Engineering     Hybrid Journal   (Followers: 5, SJR: 0.345, h-index: 20)
Arabian J. of Geosciences     Hybrid Journal   (Followers: 1, SJR: 0.417, h-index: 16)
Archaeological and Anthropological Sciences     Hybrid Journal   (Followers: 21, SJR: 1.056, h-index: 15)
Archaeologies     Hybrid Journal   (Followers: 12, SJR: 0.397, h-index: 13)
Archiv der Mathematik     Hybrid Journal   (Followers: 1, SJR: 0.597, h-index: 29)
Archival Science     Hybrid Journal   (Followers: 51, SJR: 0.804, h-index: 22)
Archive for History of Exact Sciences     Hybrid Journal   (Followers: 7, SJR: 0.28, h-index: 15)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 1, SJR: 0.946, h-index: 23)
Archive for Rational Mechanics and Analysis     Hybrid Journal   (SJR: 4.091, h-index: 66)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 4, SJR: 0.865, h-index: 40)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4, SJR: 2.841, h-index: 40)
Archives of Dermatological Research     Hybrid Journal   (Followers: 6, SJR: 0.9, h-index: 65)
Archives of Environmental Contamination and Toxicology     Hybrid Journal   (Followers: 10, SJR: 0.846, h-index: 84)
Archives of Gynecology and Obstetrics     Hybrid Journal   (Followers: 16, SJR: 0.695, h-index: 47)
Archives of Microbiology     Hybrid Journal   (Followers: 8, SJR: 0.702, h-index: 85)
Archives of Orthopaedic and Trauma Surgery     Hybrid Journal   (Followers: 8, SJR: 1.039, h-index: 56)
Archives of Osteoporosis     Hybrid Journal   (Followers: 2, SJR: 1.092, h-index: 13)
Archives of Sexual Behavior     Hybrid Journal   (Followers: 9, SJR: 1.198, h-index: 74)
Archives of Toxicology     Hybrid Journal   (Followers: 15, SJR: 1.595, h-index: 76)
Archives of Virology     Hybrid Journal   (Followers: 5, SJR: 1.086, h-index: 90)
Archives of Women's Mental Health     Hybrid Journal   (Followers: 13, SJR: 1.264, h-index: 50)
Archivio di Ortopedia e Reumatologia     Hybrid Journal  
Archivum Immunologiae et Therapiae Experimentalis     Hybrid Journal   (Followers: 2, SJR: 1.2, h-index: 42)
ArgoSpine News & J.     Hybrid Journal   (SJR: 0.102, h-index: 3)
Argumentation     Hybrid Journal   (Followers: 4, SJR: 0.295, h-index: 18)
Arid Ecosystems     Hybrid Journal   (Followers: 3)
Arkiv för Matematik     Hybrid Journal   (Followers: 1, SJR: 0.948, h-index: 22)
Arnold Mathematical J.     Hybrid Journal   (Followers: 1)
Arthropod-Plant Interactions     Hybrid Journal   (Followers: 2, SJR: 0.797, h-index: 17)
Arthroskopie     Hybrid Journal   (Followers: 1, SJR: 0.145, h-index: 8)
Artificial Intelligence and Law     Hybrid Journal   (Followers: 10, SJR: 0.288, h-index: 25)
Artificial Intelligence Review     Hybrid Journal   (Followers: 15, SJR: 0.948, h-index: 48)
Artificial Life and Robotics     Hybrid Journal   (Followers: 8, SJR: 0.231, h-index: 14)
Asia Europe J.     Hybrid Journal   (Followers: 4, SJR: 0.247, h-index: 9)
Asia Pacific Education Review     Hybrid Journal   (Followers: 9, SJR: 0.371, h-index: 17)
Asia Pacific J. of Management     Hybrid Journal   (Followers: 11, SJR: 1.676, h-index: 50)
Asia-Pacific Education Researcher     Hybrid Journal   (Followers: 11, SJR: 0.353, h-index: 13)
Asia-Pacific Financial Markets     Hybrid Journal   (Followers: 2, SJR: 0.19, h-index: 15)
Asia-Pacific J. of Atmospheric Sciences     Hybrid Journal   (Followers: 20, SJR: 1.006, h-index: 14)
Asian Business & Management     Hybrid Journal   (Followers: 7, SJR: 0.41, h-index: 10)
Asian J. of Business Ethics     Hybrid Journal   (Followers: 7)
Asian J. of Criminology     Hybrid Journal   (Followers: 5, SJR: 0.263, h-index: 8)
AStA Advances in Statistical Analysis     Hybrid Journal   (Followers: 2, SJR: 0.681, h-index: 15)
AStA Wirtschafts- und Sozialstatistisches Archiv     Hybrid Journal   (Followers: 5, SJR: 0.195, h-index: 5)
ästhetische dermatologie & kosmetologie     Full-text available via subscription  
Astronomy and Astrophysics Review     Hybrid Journal   (Followers: 21, SJR: 4.511, h-index: 44)
Astronomy Letters     Hybrid Journal   (Followers: 19, SJR: 0.58, h-index: 30)
Astronomy Reports     Hybrid Journal   (Followers: 12, SJR: 0.473, h-index: 23)
Astrophysical Bulletin     Hybrid Journal   (Followers: 2, SJR: 0.469, h-index: 11)

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Journal Cover Astrophysics
  [SJR: 0.243]   [H-I: 11]   [22 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1573-8191 - ISSN (Online) 0571-7256
   Published by Springer-Verlag Homepage  [2341 journals]
  • Supernova Remnants in the Hα and Hβ Lines
    • Authors: E. O. Vasiliev; Yu. A. Shchekinov
      Pages: 1 - 18
      Abstract: Three-dimensional gas-dynamic calculations of the evolution of supernova remnants are used to study the evolution of the emission in the Hα and Hβ recombination lines and the dispersion in the velocities of the ionized gas. The influence of variations in the abundances of chemical elements, in particular, iron, on the thermal and dynamic evolution of a supernova remnant is examined. It is found that the velocity dispersion of the gas in the shell of a young remnant varies over a wide range: essentially from zero to ~100-120 km/s, with a maximum value that decreases with time. Variation in the abundance of iron by ±0.5 dex in a gas with the solar abundance of other elements leads to a change in the thermal structure of a supernova shell and a proportionate change in the intensity of the Hα line emission. The recombination line intensity ratio I(Hα)/I(Hβ) decreases as a remnant ages, so it can serve as an indicator of its evolutionary status and can be used for more accurate identification of the contributions of supernova remnants and HII zones in I(Hα)-σ diagrams. It is shown that the ranges of the velocity dispersion of the gas and the intensity of Hα line emission for supernova shells lie within intervals that are traditionally associated with ionization zones, and this must be taken into account for correct interpretation of observations of star-formation regions in other galaxies.
      PubDate: 2017-03-01
      DOI: 10.1007/s10511-017-9458-9
      Issue No: Vol. 60, No. 1 (2017)
       
  • Polarimetry of the Nova V339 Del
    • Authors: D. N. Shakhovskoy; K. A. Antonyuk; S. P. Belan
      Pages: 19 - 27
      Abstract: Polarimetric UBVRI observations of the Nova V339 Del during the 5-108 days following the maximum of the outburst of 2013 reveal a variability in the degree of linear polarization with an amplitude of about 0.2%. The character of the variability in the polarization parameters during the period up to 30 days after the maximum is indicative of a nonspherical diffuse shell, with a geometry that is more likely bipolar than disk-shaped. In the early nebular stage (30-100 days after the maximum) a variability in the position angle of the intrinsic polarization was observed that suggests that the shape of the shell deviates from axial symmetry.
      PubDate: 2017-03-01
      DOI: 10.1007/s10511-017-9459-8
      Issue No: Vol. 60, No. 1 (2017)
       
  • Photometric Studies of the Two Magnetic Cataclysmic Variables SDSS
           J215427+155713 and SDSS J032855+052254
    • Authors: Ju. V. Babina; E. P. Pavlenko; O. I. Antonyuk
      Pages: 28 - 40
      Abstract: Data from the first long series of photometric observations of the two little-studied polars SDSS J032855+052254 and SDSS J215427+155713 (SDSS J0328 and SDSS J2154 in the following) at the Crimean Astrophysical Observatory and at the Terskol Observatory in integrated light and in the BVRc bands are analyzed. The orbital periods are refined and the orbital ephemerides are determined for the first time using these data. Two pole accretion is observed in SDSS J0328. High accuracy observations with a resolution of 15 s reveal oscillations in the brightness with a characteristic time of about 4 min and an amplitude as high as 0m.5. Based on the color indices for SDSS J2154, it is found that over the orbital cycle, there are several sources which contribute to the brightness variation with emission maxima in different spectral ranges.
      PubDate: 2017-03-01
      DOI: 10.1007/s10511-017-9460-2
      Issue No: Vol. 60, No. 1 (2017)
       
  • Long-Term Spectral Variability of the Spotted Star in Com
    • Authors: O. V. Kozlova; I. Yu. Alekseev; A. V. Kozhevnikova
      Pages: 41 - 56
      Abstract: High-resolution (R = 20000) spectral observations over many years of the spotted star IN Com in the regions of the Hα, Hβ, and He I 5876 Å lines are reported. The distinctive feature of the spectrum of this star is extended two-component emission in the Hα line over limits of ±400 km/s. This emission manifests variability caused by rotational modulation at the star’s period and variability on a time scale of many years. Similar emission is observed in the Hα and He I 5876 Å lines. These data show that the observed emission profile is formed in optically thin hot gas which forms a circumstellar disk around IN Com with a radius no greater than a few times the star’s radius. Matter is supplied to the disk by stellar wind. The observed variability of the Hα emission parameters is closely coupled to the star’s photopolarimetric activity, so that we can relate the multiyear spectral variability to the activity cycles of IN Com.
      PubDate: 2017-03-01
      DOI: 10.1007/s10511-017-9461-1
      Issue No: Vol. 60, No. 1 (2017)
       
  • Comparative Analysis of Phenomenological Approximations for the Light
           Curves of Eclipsing Binary Stars with Additional Parameters
    • Authors: I. L. Andronov; M. G. Tkachenko; L. L. Chinarova
      Pages: 57 - 69
      Abstract: A comparative analysis is made of special profiles of eclipses used for phenomenological modelling of the light curves of eclipsing binary stars. Families of functions which generalize local approximations and functions which are theoretically unlimited in width and based on a Gaussian are examined. The light curve of the classical Algol subtype (β Persei) star V0882 Car=2MASS J11080308-6145589 is used for the analysis. Dozens of modified functions with additional parameters are analyzed and 14 of these are chosen based on the criterion of a minimum sum of the squares of the deviations. The best are functions with an additional parameter which describe a profile that which is limited in phase.
      PubDate: 2017-03-01
      DOI: 10.1007/s10511-017-9462-0
      Issue No: Vol. 60, No. 1 (2017)
       
  • Investigation of Faint Galactic Carbon Stars from the First Byurakan
           Spectral Sky Survey. III. Infrared Characteristics
    • Authors: K. S. Gigoyan; A. Sarkissian; C. Rossi; D. Russeil; G. Kostandyan; M. Calabresi; F. Zamkotsian; M. Meftah
      Pages: 70 - 82
      Abstract: InfraRed (IR) astronomical databases, namely, IRAS, 2MASS, WISE, and Spitzer, are used to analyze photometric data of 126 carbon (C) stars whose spectra are visible in the First Byurakan Survey (FBS) low-resolution(lr) spectral plates. Among these, six new objects, recently confirmed on the digitized FBS plates, are included. For three of them, moderate-resolution CCD optical spectra are also presented. In this work several IR color-color diagrams are studied. Early and late-type C stars are separated in the JHK Near-InfraRed (NIR) color-color plots, as well as in the WISE W3-W4 versus W1-W2 diagram. Late N-type Asymptotic Giant Branch (AGB) stars are redder in W1-W2, while early-types (CH and R giants) are redder in W3-W4 as expected. Objects with W2-W3 > 1.0 mag. show double-peaked spectral energy distribution (SED), indicating the existence of the circumstellar envelopes around them. Twnty-six N-type stars have IRAS Point Source Catalog (PSC) associations. For FBS 1812+455, IRAS Low-Resolution Spectra (LRS) in the wavelength range 7.7 ÷ 22.6 μm and Spitzer Space Telescope Spectra in the range 5 ÷ 38μm are presented, clearly showing absorption features of C2H2 (acetylene) molecule at 7.5 and 13.7 μm, and the SiC (silicone carbide) emission at 11.3 μm. The mass-loss rates for eight Mira-type variables are derived from the K-[12] color and from the pulsation periods. The reddest object among the targets is N-type C star FBS 2213+421, which belongs to the group of the cold post-AGB R Coronae Borealis (R CrB) variables.
      PubDate: 2017-03-01
      DOI: 10.1007/s10511-017-9463-z
      Issue No: Vol. 60, No. 1 (2017)
       
  • Variation in the Flux Density of the Radio Source Cassiopeia-A During the
           Period 2007-2015
    • Authors: R. M. Martirosyan; A. G. Gulyan; G. A. Pirumyan; S. A. Sargsyan; G. S. Avetisyan
      Pages: 83 - 89
      Abstract: Data from regular radio astronomical observations (2007-2015) at the Saravand scientific test station of the Institute of Radio Physics and Electronics, National Academy of Sciences of the Republic of Armenia, are used to discuss the yearly average variation in the intensity of the radio emission from the radio source Cassiopeia-A and the reliability of the periodicity in the variation of the radio flux. It is shown that during this period the intensity of the radio emission from Cassiopeia-A decreased at a yearly average rate of 0.55%, but data on the yearly averages for 2007-2015 indicate a curve with a short (about 2.7-3 years) period.
      PubDate: 2017-03-01
      DOI: 10.1007/s10511-017-9464-y
      Issue No: Vol. 60, No. 1 (2017)
       
  • Magnetic Field of Sunspots During the Rising Phase of Activity Cycle 24
    • Authors: O. S. Gopasyuk
      Pages: 90 - 99
      Abstract: The magnetic field structure of isolated sunspots during the rising phase of activity cycle 24 has been studied using many-hour series of magnetograms of the longitudinal field and images in the continuum taken with the Helioseismic and Magnetic Imager (HMI) on NASA’s Solar Dynamic Observatory (SDO). The magnetic axis of the lines of force of the magnetic field of the sunspots was found to be inclined to the west. The average angle of inclination is 1-4° and its magnitude is independent of the heliographic latitude of a sunspot.
      PubDate: 2017-03-01
      DOI: 10.1007/s10511-017-9465-x
      Issue No: Vol. 60, No. 1 (2017)
       
  • Effect of Viscosity on Shock Waves Observed After Two Different Coronal
           Mass Ejection Activities CME20/11/2003 and CME11/04/2010
    • Authors: H. Cavus; G. Zeybek
      Pages: 100 - 110
      Abstract: Coronal mass ejections are the main results of powerful solar activity. These activities are capable of generating shock waves in the interplanetary medium. The shock waves happen when the solar particles change their velocities from supersonic to subsonic. Since the interaction of shock waves with viscosity is one of the central problems in the supersonic regime of compressible gas flow, investigations of these events play a crucial role in space weather research [1]. The main purpose of this study is to study the effects of viscosity on the shock waves observed after the CMEs of 20/11/2003 and CME11/04/2010.
      PubDate: 2017-03-01
      DOI: 10.1007/s10511-017-9466-9
      Issue No: Vol. 60, No. 1 (2017)
       
  • Contribution to the Total Recombination Rate from Three-Body Recombination
           into Highly Excited States Under the Conditions of Stellar Atmospheres and
           the Interstellar Medium
    • Authors: O. M. Belova; K. V. Bychkov
      Pages: 111 - 117
      Abstract: In stellar atmospheres and regions of the interstellar medium with electron densities above 104 cm-3, three-body recombination into high levels of the hydrogen atom with principal quantum numbers k >> 1 can play a more important role than radiative recombination into lower states.
      PubDate: 2017-03-01
      DOI: 10.1007/s10511-017-9467-8
      Issue No: Vol. 60, No. 1 (2017)
       
  • Determination of the Superflare Frequency Distribution Function of
           Solar-Type Stars
    • Authors: A. A. Akopian
      Pages: 118 - 128
      Abstract: This is a statistical study of a sample of 1547 superflares in 270 stars found during an analysis of data on more than 80000 stars of the sun’s type (obtained by the Kepler orbital observatory during the first 500 days of observations). Estimates are given of the total number of stars capable of superflares and the superflare distribution frequency function is determined.
      PubDate: 2017-03-01
      DOI: 10.1007/s10511-017-9468-7
      Issue No: Vol. 60, No. 1 (2017)
       
  • Burgers Vortex in a Protoplanetary Disk
    • Authors: M. G. Abrahamyan
      Pages: 129 - 141
      Abstract: The effect of a Burgers vortex on the formation of planetesimals in a protoplanetary disk is examined in a local approximation. It is shown that a Burgers vortex with a uniformly rotating core and a converging radial flow of matter can efficiently accumulate dusty matter with a mass on the order of 1027-1028 g in its core region over a characteristic time of ~106-107 years. In the localization region of the Burgers vortex, the thickness of the disk increases.
      PubDate: 2017-03-01
      DOI: 10.1007/s10511-017-9469-6
      Issue No: Vol. 60, No. 1 (2017)
       
  • Accelerated Expansion of the Early and Late Universe in Terms of the
           Scalar-Tensor Theory of Gravitation. I
    • Authors: R. M. Avagyan; G. H. Harutyunyan; S. V. Sushkov
      Pages: 142 - 152
      Abstract: The basic idea behind the evolutionary development of the early universe is that the hot stage was preceded by the inflationary stage. In most modern concepts of the inflationary regime, it is assumed that a specific scalar field (inflaton) is present which expands space at enormous rates, while the temperature falls rapidly, real particles almost vanish, and the universe is filled by a vacuum with the equation of state P = – ɛ. In the first part of this article, the cosmological scalar of the modified Jordan-Brans-Dicke (JBD) theory is chosen to be the inflaton. Problems in the “Einstein” and proper representations of the JBD theory are considered.
      PubDate: 2017-03-01
      DOI: 10.1007/s10511-017-9470-0
      Issue No: Vol. 60, No. 1 (2017)
       
  • Origin of the Blue Continuum Radiation in the Flare Spectra of dMe Stars
    • Authors: E. S. Morchenko
      Abstract: Calculations of the emission spectrum of a homogeneous plane layer of pure hydrogen plasma taking into account nonlinear effects (the influence of bremsstrahlung and recombination radiation of the layer itself on its Menzel factors) show that the Planck radiation (the blue component of the optical continuum) during the impulsive phase of large flares on dMe stars originates from the deep (nearphotospheric) layers of the atmosphere. Radiative cooling of the gas behind the front of a stationary shock propagating toward the photosphere of a red dwarf is not capable to create the Planck radiation observed at the peak brightness of the flares.
      PubDate: 2016-11-18
      DOI: 10.1007/s10511-016-9450-9
       
  • On the Origin of Rotation in the Universe
    • Authors: A. M. Krigel
      Abstract: The evolution of small perturbations produced by gravitational instability in ideal gases is examined in a Newtonian approach. As opposed to the classical theory, here effects associated with fluctuationinduced fluxes of matter are taken into account. It is shown that for sufficiently small wave numbers, both longitudinal and vortex perturbations can grow and this explains the origin of galactic rotation in an initially uniform, isotropic, irrotational universe.
      PubDate: 2016-11-18
      DOI: 10.1007/s10511-016-9453-6
       
  • The N/O Ratio in Early B-Type Main Sequence Stars as an Indicator of Their
           Evolution
    • Authors: L. S. Lyubimkov
      Abstract: It is shown that, in the case of early B-type main-sequence stars, of the three ratios N/C, C/O, and N/O which are regarded as indicators of stellar evolution, the ratio N/O is more reliable since it seems to be insensitive to overionization of the NII and OII ions. On the other hand, the N/C and C/O ratios, which include carbon, may contain systematic errors for stars with Teff > 18500 K because of neglected overionization of CII ions. The ratio N/O is studied in the atmospheres of 46 early main-sequence B stars. These values of N/O are examined as functions of the effective temperature, age, rotation speed, and mass of the stars. Most early B-stars in the main sequence are found to have [N/O] ≈ 0, which indicates that N/O varies little during the main sequence stage, and this result is independent of the basic parameters listed above. There are two explanations for the large number of stars with [N/O] ≈ 0 : it is predicted theoretically that for an initial rotation velocity V0 < 100 km/s, N/O varies little toward the end of the main sequence stage ([N/O] < 0.2) and observations show that most early main-sequence B-stars do actually have low initial rotation velocities V0. The few early main-sequence B-stars with higher [N/O] = 0.4-0.8 correspond to models with rotation velocities V0 = 200-300 km/s. This conclusion is consistent with earlier data for stars with the same masses in a later stage of evolution: the AFGsupergiant and bright giant stage.
      PubDate: 2016-11-18
      DOI: 10.1007/s10511-016-9449-2
       
  • Modelling the Gas Dynamics of Protoplanetary Disks by the SPH Method
    • Authors: T. V. Demidova
      Abstract: A modification of the GADGET-2 program package is proposed for three-dimensional modelling of gasdynamic flows in protoplanetary disks when perturbing objects (components of a binary system, brown dwarfs, protoplanets) are present. In these systems, the matter in the common disk falls onto the central star and companions to form accretion disks around them. The GADGET-2 code has been supplemented for calculating the accretion rate to each massive object and the line density of matter in the direction toward the central star as functions of the phase of the orbital period. The orbital parameters of the companion are specified as initial conditions for the problem. These orbits can be circular, eccentric, or inclined relative to the plane of the disk. With the aid of the modified code, details in the inner parts of the disk can be calculated with high accuracy: the accretion disks of the star and the companion are identified, as well as the gas bridge between them, flows of matter from the common disk which fill the accretion disks with matter, and density waves in the accretion and common disks.
      PubDate: 2016-11-17
      DOI: 10.1007/s10511-016-9448-3
       
  • Hypersurface Homogeneous Cosmological Model in Modified Theory of
           Gravitation
    • Authors: S. D. Katore; S. P. Hatkar; R. J. Baxi
      Abstract: We study a hypersurface homogeneous space-time in the framework of the f (R, T) theory of gravitation in the presence of a perfect fluid. Exact solutions of field equations are obtained for exponential and power law volumetric expansions. We also solve the field equations by assuming the proportionality relation between the shear scalar (σ ) and the expansion scalar (θ ). It is observed that in the exponential model, the universe approaches isotropy at large time (late universe). The investigated model is notably accelerating and expanding. The physical and geometrical properties of the investigated model are also discussed.
      PubDate: 2016-11-17
      DOI: 10.1007/s10511-016-9455-4
       
  • White Dwarf Stars as Polytropic Gas Spheres
    • Authors: M. I. Nouh; A. S. Saad; W. H. Elsanhoury; A. A. Shaker; B. Korany; T. M. Kamel
      Abstract: We expect that relativistic effects play an important role in compact stars because their electrons are highly degenerate. In this paper, we study the properties of condensed matter in white dwarfs using Newtonian and relativistic polytropic fluid spheres. We propose two polytropic indices (n = 3 and n = 1.5) to investigate the physical characteristics of the models. We numerically solve the Lane-Emden equations and demonstrate that the relativistic effect is small in white dwarf stars.
      PubDate: 2016-11-17
      DOI: 10.1007/s10511-016-9456-3
       
  • New Emission Stars in B Cyg OB7
    • Authors: N. D. Melikian; A. A. Karapetian; J. Gomez
      Abstract: This is a continuation of a search for and study of emission objects in known dark clouds and star formation regions. New results are presented from a search for emission stars in the region of Cyg OB7 where 36 new emission stars have been discovered previously. The current observations were made adjacent to previously studied regions in the vicinity of the object HH 448. 26 new emission stars were found in three small regions with a combined area of 0.11 sq. deg. On an (H-K)-(J-H) two-color diagram these stars lie among the classical T Tau stars (CTTS) and T Tau stars with weak lines (WTTS). A strong change in brightness was recorded for one of the emission stars.
      PubDate: 2016-11-17
      DOI: 10.1007/s10511-016-9451-8
       
 
 
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