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Showing 1 - 200 of 2353 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: 20, SJR: 1.192, h-index: 74)
AAPS PharmSciTech     Hybrid Journal   (Followers: 6, SJR: 0.718, h-index: 54)
Abdominal Imaging     Hybrid Journal   (Followers: 14, 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: 11, 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: 14, 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: 4)
Acta Geodaetica et Geophysica     Hybrid Journal   (Followers: 1, SJR: 0.294, h-index: 13)
Acta Geotechnica     Hybrid Journal   (Followers: 7, SJR: 1.818, h-index: 22)
Acta Informatica     Hybrid Journal   (Followers: 5, SJR: 0.524, h-index: 32)
Acta Mathematica     Hybrid Journal   (Followers: 11, 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: 19, SJR: 0.898, h-index: 52)
Acta Mechanica Sinica     Hybrid Journal   (Followers: 5, 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: 5, 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)
Activitas Nervosa Superior     Hybrid Journal  
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: 15, 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: 3)
Advances in Data Analysis and Classification     Hybrid Journal   (Followers: 54, SJR: 1.113, h-index: 14)
Advances in Gerontology     Partially Free   (Followers: 9, SJR: 0.141, h-index: 3)
Advances in Health Sciences Education     Hybrid Journal   (Followers: 22, 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: 41, 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: 9, SJR: 0.821, h-index: 49)
African Archaeological Review     Hybrid Journal   (Followers: 15, 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: 3, SJR: 0.706, h-index: 19)
Akupunktur & Aurikulomedizin     Full-text available via subscription   (Followers: 1)
Algebra and Logic     Hybrid Journal   (Followers: 3, 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: 4, 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: 15, SJR: 1.094, h-index: 87)
American J. of Cardiovascular Drugs     Hybrid Journal   (Followers: 13, SJR: 0.864, h-index: 39)
American J. of Community Psychology     Hybrid Journal   (Followers: 23, SJR: 1.237, h-index: 83)
American J. of Criminal Justice     Hybrid Journal   (Followers: 6, 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: 12, SJR: 0.18, h-index: 13)
Amino Acids     Hybrid Journal   (Followers: 8, 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: 3, SJR: 0.665, h-index: 7)
Analysis in Theory and Applications     Hybrid Journal   (Followers: 1)
Analysis of Verbal Behavior     Hybrid Journal   (Followers: 5)
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: 16, 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: 9)
Annals of Dyslexia     Hybrid Journal   (Followers: 9, SJR: 0.857, h-index: 40)
Annals of Finance     Hybrid Journal   (Followers: 28, 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: 14, 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: 10, 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 Ophthalmology     Hybrid Journal   (Followers: 10)
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: 10, SJR: 0.553, h-index: 8)
Annals of Surgical Oncology     Hybrid Journal   (Followers: 13, 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: 8, 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 Cancer Research     Open Access  
Applied Categorical Structures     Hybrid Journal   (Followers: 2, SJR: 0.361, h-index: 21)
Applied Composite Materials     Hybrid Journal   (Followers: 48, 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: 8, SJR: 0.541, h-index: 13)
Applied Intelligence     Hybrid Journal   (Followers: 12, SJR: 0.777, h-index: 43)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4, 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: 62, 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: 8, 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: 17, 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: 22, 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: 4, 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: 53, 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 and Museum Informatics     Hybrid Journal   (Followers: 120)
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: 17, 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: 17, 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: 5, 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: 1, 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: 14, 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: 12, 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  

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Journal Cover Astrophysics
  [SJR: 0.243]   [H-I: 11]   [23 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  [2353 journals]
  • Active Stage of the Object CH Cyg B in 2014-2015
    • Authors: L. N. Kondratyeva; F. K. Rspaev; M. A. Krugov; A. V. Serebryanskiy
      Pages: 153 - 164
      Abstract: The results of spectral and photometric observations of the emission object CH Cyg are presented. The active stage of CH Cyg during 2014-2015 showed up as an increase in the brightnesses to B~7m.8 and V~6m.8, intensification of the continuum, and increased fluxes in emission lines. A rapid, within days, variability in the emission line profiles was observed. The velocities of individual absorption components were as high as ~3000 km/s.
      PubDate: 2017-06-01
      DOI: 10.1007/s10511-017-9471-z
      Issue No: Vol. 60, No. 2 (2017)
  • Individual Photoelectric UBV Observations of the Massive Early-Type Binary
           System V729 Cyg (Cyg OB2 No. 5)
    • Authors: M. I. Kumsiashvili; K. B. Chargeishvili
      Pages: 165 - 172
      Abstract: Individual UBV photoelectric observations of the massive eclipsing binary system V729 Cyg, located in the stellar association Cyg OB2, are presented. The spread in the data points exceeds the measurement error. This is clearly the result of active physical processes in the system.
      PubDate: 2017-06-01
      DOI: 10.1007/s10511-017-9472-y
      Issue No: Vol. 60, No. 2 (2017)
  • Photometric and Kinematic Properties of the Nearby Open Star Cluster NGC
    • Authors: A. A. Haroon; H. A. Ismaill; W. H. Elsanhoury
      Pages: 173 - 187
      Abstract: In this paper, the photometric parameters (including the limited core and tidal radii, distances, luminosity and mass functions, total mass, and relaxation time) of the intermediate-aged open star cluster, NGC 2112, are estimated based on data collected from the PPMXL catalog. The kinematic properties of the cluster are also estimated. NGC 2112 lies nearby, at a distance of 898 ± 41 pc from the Sun, with an age of log(age) = 9.25 ± 0.05 assuming solar metallicity (Z = 0.019). The estimated relaxation time of the cluster is shorter than its estimated age, which indicates that the cluster may be dynamically relaxed. The position of the cluster convergent point or apex is computed using the AD diagram method and is found to have the equatorial coordinates 59o.430, -19o.398. Finally, the parameters of the cluster ellipsoidal velocity are also computed.
      PubDate: 2017-06-01
      DOI: 10.1007/s10511-017-9473-x
      Issue No: Vol. 60, No. 2 (2017)
  • Resonance Line Formation in Moving Gas Flows with High Porosity
    • Authors: S. G. Shulman
      Pages: 188 - 199
      Abstract: The formation of resonance lines in gas flows generated by interactions of circumstellar gas with a star’s magnetosphere is examined. An effective method is proposed for calculating these lines when the magnetospheric wind is highly porous. The resonance sodium lines observed in the spectrum of UX Ori type star RZ Psc are modelled as an example. It is shown that the narrow absorptions observed in the short wavelength wings of these lines can be formed by scattering of the star’s radiation in two gas jets that are semitransparent at the line frequencies when they cross the line of sight.
      PubDate: 2017-06-01
      DOI: 10.1007/s10511-017-9474-9
      Issue No: Vol. 60, No. 2 (2017)
  • Ionization from Excited States as a Cause of Nonstationary Populations of
           Hydrogen Levels Behind A Shock Front
    • Authors: O. M. Belova; K. V. Bychkov
      Pages: 200 - 212
      Abstract: It is shown that for the luminescence of hydrogen in shock fronts in the atmospheres of stars in late spectral classes, the level populations of the hydrogen atoms are determined by the entire prehistory of the process, beginning with heating in the shock front, as well as by the instantaneous electron temperature and density. Ionization from excited states with principal quantum numbers 2 ≤ k ≤ 6 plays an important role. The role of highly excited states of hydrogen atoms as they are ionized in shock fronts under the conditions of stellar atmospheres is clarified. The contribution of states with k > 10 to the ionization rate can substantially exceed the rate of ionization from the ground state.
      PubDate: 2017-06-01
      DOI: 10.1007/s10511-017-9475-8
      Issue No: Vol. 60, No. 2 (2017)
  • On High and Low Starting Frequencies of Type II Radio Bursts
    • Authors: J. Sharma; N. Mittal
      Pages: 213 - 222
      Abstract: We have studied the characteristics of type II radio burst during the period May 1996 to March 2015, for the solar cycle 23 and 24, observed by WIND/WAVES radio instrument. A total of 642 events were recorded by the instrument during the study period. We have divided the events with two starting frequency range (high > 1 MHz; low ≤ 1MHz) as type II1 (i.e., 1-16 MHz) radio burst and type II2 (i.e., 20 KHz - 1020 KHz) radio burst which constitute the DH and km type II radio burst observed by WIND spacecraft, and determined their time and frequency characteristics. The mean drift rate of type II1 and type II2 radio bursts is 29.76 × 10-4 MHz/s and 0.17 × 10-4 MHz/s respectively, which shows that type II1 with high start frequency hase larger drift rate than the type II2 with low starting frequencies. We have also reported that the start frequency and the drift rate of type II1 are in good correlation, with a linear correlation coefficient of 0.58.
      PubDate: 2017-06-01
      DOI: 10.1007/s10511-017-9476-7
      Issue No: Vol. 60, No. 2 (2017)
  • Can Flare Stars Explain the Annihilation Line from the Galactic Bulge'
    • Authors: G. S. Bisnovatyi-Kogan; A. S. Pozanenko
      Pages: 223 - 227
      Abstract: We consider the low-mass flare stars which form the bulk of the population in the galactic bulge as a source of the positrons needed to form the observed narrow annihilation line from the galactic bulge. Estimates based on the observed flares in low-mass stars, together with observations of the annihilation line in solar flares, show that the rate of production of positrons in flares in the stars in the bulge may be sufficient to explain the formation of the narrow stationary annihilation line observed from the region of the galactic bulge.
      PubDate: 2017-06-01
      DOI: 10.1007/s10511-017-9477-6
      Issue No: Vol. 60, No. 2 (2017)
  • Modelling the Transition Layer of an Accretion Disk with a Burgers Vortex
    • Authors: M. G. Abrahamyan
      Pages: 228 - 241
      Abstract: The possibility of representing the transition (boundary) layer of an accretion disk around young stellar objects as a Burgers vortex is examined. The basic physical and geometrical characteristics of the transition layer are obtained. It is shown that, depending on the parameters of the system, the transition layer as a Burgers vortex can produce a bipolar outflow (active phase) or ensure the capture of accreting matter by the central body.
      PubDate: 2017-06-01
      DOI: 10.1007/s10511-017-9478-5
      Issue No: Vol. 60, No. 2 (2017)
  • Plane Symmetric Anisotropic Dark Energy Cosmological Model in the Bimetric
           Theory of Gravitation
    • Authors: M. S. Borkar; A. Ameen
      Pages: 242 - 258
      Abstract: The plane symmetric space-times with anisotropic dark energy and with constant deceleration parameter have been derived by solving the Rosen's field equations in the Bimetric theory of gravitation. We explored both models in power law as well as in exponential law. In power law, the model attains both phases accelerating as well as decelerating in the expansion with anisotropic fluid, which is in the form of dark energy, and there is no chance of real matter in this power law. In exponential law, the model is dust, isotropized in nature with constant acceleration in the expansion. Further, other geometrical and physical aspects of the models are also studied.
      PubDate: 2017-06-01
      DOI: 10.1007/s10511-017-9479-4
      Issue No: Vol. 60, No. 2 (2017)
  • Stability of Accelerating Universe with Linear Equation of State in f ( T
           ) Gravity Using Hybrid Expansion Law
    • Authors: S. R. Bhoyar; V. R. Chirde; S. H. Shekh
      Pages: 259 - 272
      Abstract: We investigate the dynamics of locally rotationally symmetric and spatially homogeneous Bianchi type-I (LRS) space-time with the linear equation of state filled with a perfect fluid in the framework of f (T) gravity. We apply the gravitational field equations for the linear and quadratic form of f (T) gravity. We determine the aspects of Bianchi type-I space-time by considering the hybrid expansion law (HEL) for the average scale factor that yields power-law and exponential-law cosmologies, in its special cases. It is observed that initially the model is unstable and is then stable in both linear and quadratic case. Also, the universe exhibits transition from deceleration to acceleration phase.
      PubDate: 2017-06-01
      DOI: 10.1007/s10511-017-9480-y
      Issue No: Vol. 60, No. 2 (2017)
  • Be Stars in Open Stellar Clusters
    • Authors: A. E. Tarasov
      Pages: 273 - 294
      Abstract: The current status of the problem of anomalous increases in the relative number of Be stars in young open stellar clusters is summarized in this article. The relative content of Be stars is shown to increase with the age of the clusters and reaches a maximum for stars in spectral classes B0-B3 when the age of the clusters is 12-20 Myr. In some clusters that are rich in B stars, the relative content exceeds 40%. It is shown that in young clusters with ages less than 9 Myr, Be stars are very rare or not observed at all. Models of the evolution of rotating massive stars indicates that the Be phenomenon may occur toward the end of the lifetime of B stars in the main sequence because of an increase in the ratio of the rotation velocity of a star to the critical velocity, but this cannot explain the presence of more than 40% Be stars in some young open stellar clusters. In this review, considerable attention is devoted to massive binary systems in different stages of the evolution of the binary system. The transfer of angular momentum during exchanges of mass in systems with different periods is a noteworthy alternative to the evolution of angular momentum in single stars. Some examples are shown of binary systems of different types which are or may be encountered in open stellar clusters.
      PubDate: 2017-06-01
      DOI: 10.1007/s10511-017-9481-x
      Issue No: Vol. 60, No. 2 (2017)
  • More Satellites Around the Nearby Spiral Galaxy NGC 7331
    • Authors: M. Blauensteiner; P. Remmel; P. Riepe; H. Strauß; U. Trulson; T. Zilch; I. D. Karachentsev; M. E. Sharina
      Pages: 295 - 299
      PubDate: 2017-06-01
      DOI: 10.1007/s10511-017-9482-9
      Issue No: Vol. 60, No. 2 (2017)
  • New CH Carbon Stars Found in the DFBS
    • Authors: G. Kostandyan; K. S. Gigoyan; A. Sarkissian; M. Meftah; F. Zamkotsian
      Pages: 300 - 303
      PubDate: 2017-07-04
      DOI: 10.1007/s10511-017-9483-8
      Issue No: Vol. 60, No. 2 (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)
  • 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)
  • 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)
  • 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)
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