Results 51 to 60 of about 2,931,024 (350)
Magnetic activities of two contact binaries in quadruple stellar systems. [PDF]
Sci RepYang Y, Wang S.
europepmc +3 more sources
Two Massive Twins in a Deep-contact Binary with a Black Hole Candidate
Astrophysical Journal, 2019 New light curves in B, V, R, and I bands for the B-type contact binary V593 Cen were obtained, and another V-band light curve was collected from All Sky Automated Survey data. We analyzed these two sets of light curves using the Wilson–Devinney code.
Z. Ergang +7 more
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A low-mass-ratio and deep contact binary as the progenitor of the merger V1309 Sco [PDF]
, 2016 Nova Sco 2008 (=V1309 Sco) is an example of a V838 Mon type eruption rather than a typical classical nova. This enigmatic object was recently shown to have resulted from the merger of two stars in a contact binary. It is the first stellar merger that was
Li-ying Zhu, E. Zhao, Xiao Zhou
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The Evolution of Contact Binaries [PDF]
Symposium - International Astronomical Union, 1976 Asymmetric light curves and period changes of contact binaries can be explained by large-scale prominence activity. From the mass outflow accompanying this activity the mean lifetime of a contact binary is estimated as 5 × 107 yr. From the lifetimes of contact binaries and normal solar type dwarfs on the one hand and the proportion of the former among ...
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Astronomical JournalPhotometric observations were made with standard filters in four observatories for 10 contact binary systems. We analyzed the orbital period variations of the systems and found that six of them show long-term changes.
A. Poro +9 more
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CN Andromedae: a shallow contact binary with a possible tertiary component
Research in Astronomy and Astrophysics, 2019 In this study, new photometric observations of shallow contact binary CN Andromedae (CN And) were performed and multi-color (BV R) CCD light curves (LCs) were obtained. Simultaneous analysis of new LCs and published radial velocity (RV) data reveals that
M. F. Yıldırım +2 more
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Physical properties and evolutionary status of the W-subtype contact binary V502 Oph with a stellar companion [PDF]
, 2016 Multi-color ($B$ $V$ $R_c$ $I_c$) CCD photometric light curves of the contact binary V502 Oph are analyzed using the Wilson-Devinney (W-D) program. The solutions reveal that V502 Oph is a W-subtype contact ($f = 35.3\,\%$) binary system.
Xiao Zhou +4 more
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The Astrophysical Journal, 1981 Densities, corrected primary colors, minimum periods, inferred masses, luminosities, and specific angular momenta are computed from data on 37 W Ursae Majoris systems. A-type systems, having lower densities and angular momenta than the W-type systems, are shown to be evolved, and a new class of contact binary is identified, the OO Aquilae systems ...
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Theories of Contact Binary Stars [PDF]
Symposium - International Astronomical Union, 1980 We review and contrast two current theories for the structure of contact binary stars: discontinuity theory and thermal relaxation oscillation theory. We find that the two theories are complementary with the crucial theoretical issue to be resolved being the secular stability of the temperature inversion layer. Critical observational tests remain to be
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A SOLAR-TYPE STELLAR COMPANION TO A DEEP CONTACT BINARY IN A QUADRUPLE SYSTEM [PDF]
, 2016 The four-color (B, V, Rc, Ic) light curves of V776 Cas are presented and analyzed using the Wilson–Devinney method. It is discovered that V776 Cas is an early F-type (F2V) overcontact binary with a very high contact degree (f = 64.6%) and an extremely ...
Xingtai Zhou +5 more
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