Results 31 to 40 of about 2,489,433 (294)
Minimum mass ratio of contact binary stars
, 2022 Mass ratio $q$ of a contact binary star evolves due to mass transfer, magnetic braking, and thermal relaxation oscillations to small values until it crosses a critical threshold $q_\text{min}$.
Ondřej Pejcha, Milan Pešta
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Invariants of binary forms [PDF]
, 2014 We work over the field of complex numbers. Consider the set V_n of binary forms of degree n, i.e., homogeneous polynomials of degree n in two variables. An invariant of V_n is a polynomial in the coefficients of a form in V_n whose value does not change ...
Popoviciu Draisma, Mihaela Ileana
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The lifetime of contact binaries [PDF]
Proceedings of the International Astronomical Union, 2012 AbstractThe lifetime of contact binaries is an important parameter for studying the evolution of contact binaries. By reproducing the relative frequency of occurrence for contact binaries, we found that the lifetime of contact binaries decreases with increasing mass of the primaries. The lifetime of contact binaries is about 4%–10% of the main sequence
D. K. Jiang +3 more
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Symposium - International Astronomical Union, 1976 Observational statements about close and contact binaries are compared with the theoretical consequences of assuming that contact binaries have a common convective envelope. It is concluded that such contact systems cannot be in thermal equilibrium, and that the inefficiency of convective heat transport in the common envelope must be allowed for.
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The detached-binary channel for the formation of contact binaries [PDF]
Monthly Notices of the Royal Astronomical Society, 2013 The detached-binary channel is an important channel for the formation of contact binaries, according to which a detached binary might evolve into contact by evolutionary expansion of the components, or angular momentum loss through the effect of magnetic braking (MB).
Jiang, Dengkai, Han, Zhanwen, Li, Lifang
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Contact Binaries of Spectral Type O [PDF]
Symposium - International Astronomical Union, 1979 The eclipsing binaries UW CMa, AO Cas, and V729 Cyg have been systems of great interest for over fifty years. The light curves are complex and suffer significant changes on a time scale of months, but the primary attraction of these systems is that both components have O-type spectra; thus they present us with some of the few possibilities for direct ...
Kam-Ching Leung, Donald P. Schneider
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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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Period Change of the Contact Binary AH Tauri [PDF]
Journal of Astronomy and Space Sciences, 2004 New BVRI photometric observations of the contact binary AH Tau were performed with the 61 cm reflector and a 2K CCD camera at the Sobaeksan Optical Astronomy Observatory during seven nights from September to December, 2001. A total of 144 times of minima
Dongjoo Lee +5 more
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The Plutino Population: An Abundance of Contact Binaries [PDF]
The Astronomical Journal, 2018 Abstract We observed 12 Plutinos over two separated years with the 4.3 m Lowell’s Discovery Channel Telescope. Here, we present the first light-curve data for those objects. Three of them (2014 JL80, 2014 JO80, and 2014 JQ80) display a large light-curve amplitude explainable by a single elongated object, but they are most likely caused ...
Audrey Thirouin, Scott S. Sheppard
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The structure of contact binaries [PDF]
Astronomy & Astrophysics, 2004 17 pages, 28 figures, accepted by A& ...
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