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Mass-ratio distribution of contact binary stars [PDF]
Astronomy & Astrophysics, 2023 The mass ratioqof a contact binary star evolves through mass transfer, magnetic braking, and thermal relaxation oscillations to low values until it crosses a critical thresholdqmin. When this occurs, the binary undergoes the tidal Darwin instability, leading to a rapid coalescence of the components and to an observable brightening of the system.
Milan Pešta
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Chromospheric activity in bright contact binary stars [PDF]
Astronomy & Astrophysics, 2020 Context. Studying chromospheric activity of contact binaries is an effective way of revealing the magnetic activity processes of these systems. One efficient but somewhat neglected method for this purpose is to follow the changes of the Hα line profiles via optical spectroscopy. Aims. Our goal is to perform a comprehensive preliminary analysis based on
T. Mitnyan +9 more
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Contact tracing of binary stars: Pathways to stellar mergers [PDF]
Astronomy & Astrophysics, 2023 Stellar mergers are responsible for a wide variety of phenomena such as rejuvenated blue stragglers, highly magnetised stars, spectacular transients, iconic nebulae, and stars with peculiar surface chemical abundances and rotation rates. Before stars merge, they enter a contact phase.
Jan Henneco +2 more
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The light-curve intrinsic variability in 47 Kepler contact binary stars [PDF]
Monthly Notices of the Royal Astronomical Society, 2022 ABSTRACT This work studies the significance of light-curve intrinsic variability in the numerical modelling of contact binaries. Using synthetic light curves, we show that the starspot-based intrinsic variability increases the apparent mass ratio by $\Delta q=5{{\ \rm per\ cent}}$.
B. Dȩbski
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Masses and angular momenta of contact binary stars [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2006 Abstract Results are presented on component masses and system angular momenta for over 100 low-temperature contact binaries. It is found that the secondary components in close binary systems are very similar in mass. Our observational evidence strongly supports the argument that the evolutionary process goes from near-contact binaries to
K. Gazeas, P. G. Niarchos
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AROSATSurvey of Contact Binary Stars [PDF]
The Astronomical Journal, 2006 19 pages, 5 figures, accepted by ...
M. T. Geske, S. J. Gettel, T. A. McKay
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Contact Binary Stars as Standard Candles [PDF]
, 1995 review presented at Binaries in Clusters meeting, Calgary, Alberta, June 19-23, 1995. uufiles compressed Post-Script text and 4 figures.
S. M. Ruciński
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Absolute Dimensions of Contact Binary Stars in Baade Window [PDF]
Journal of Astronomy and Space Sciences, 1999 The light curves of the representative 6 contact binary stars observed by OGLE Project of searching for dark matter in our Galaxy have been analyzed by the method of the Wilson and Devinney Differential Correction to find photometric solutions.
Young Woon Kang
doaj +2 more sources
International Astronomical Union Colloquium, 1983 Abstract:Ultraviolet and X-ray surveys of the W Ursae Majoris type stars are reviewed. These systems exhibit extended coronas and transition regions that are confined close to the optically determined surfaces. Correlations of X-ray activity with period or rotational velocity indicate a turn-over or saturation of emission at the short periods or high ...
A. K. Dupree
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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
Frank H. Shu
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