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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 $q_\text{min}$. When that happens, the binary undergoes the tidal Darwin instability leading to a rapid coalescence of the components and observable brightening of the system ...
Pešta, Milan, Ondřej Pejcha
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Photometric study of contact binary star MW And [PDF]
New Astronomy, 2019 The Tarleton Observatory's 0.8m telescope and CCD photometer were used to obtain 1298 observations of the short period eclipsing binary star MW And. The observations were obtained in Johnson's BVR filters. The light curves show that MW And is an eclipsing binary star with a period of 0.26376886 days. Further analysis showed that the period of MW And is
Ahmed Waqas Zubairi +2 more
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Mass Ratio Estimates for Overcontact Binaries Using the Derivatives of Light Curves
The Astrophysical Journal, 2023 The photometric mass ratios of eclipsing binaries are usually estimated by light-curve modeling with an iterative method. We propose a new method for estimating the photometric mass ratio of an overcontact binary using the derivatives of a light curve ...
Shinjirou Kouzuma
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Photometric study of the contact binary star V861 Herculis [PDF]
Astronomy & Astrophysics, 2004 First Cousins V(RI)C light curves of the W UMa-type eclipsing variable star V861 Herculis are presented. The system was observed in 2000 and 2003. The light curves obtained at different epochs showed significant deviation from each other. The O'Connell effect was about ∆V = 0.05 mag in 2000 but it vanished in 2003 (except the night of February 22/23 ...
Sz. Csizmadia +3 more
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Microwave emission from southern contact-binary stars
The Astronomical Journal, 1993 We report the results of high-sensitivity 4.8 GHz observations of four southern contact-binary stars (AE Phe, YY Eri, RW Dor, and V757 Cen) made with the Australia Telescope Compact Array. None of these stars were detected above a 4σ level of 0.4 mJy.
A. J. Beasley +4 more
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Three Ultra-short-period Contact Eclipsing Binary Systems Mined from Massive Astronomical Surveys
The Astronomical Journal, 2023 We present the photometric analysis of three ultra-short-period total eclipsing binaries in contact configuration, CRTS_J172718.0+431624, OGLE-BLG-ECL-000104, and OGLE-BLG-ECL-000012, mined from massive astronomical surveys.
Athanasios Papageorgiou +5 more
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The near-contact binary star RZ Dra revisited
New Astronomy, 2011 Abstract This paper presents the absolute parameters of RZ Dra. New CCD observations were made at the Mt. Suhora Observatory in 2007. Two photometric data sets (1990 BV and 2007 BVRI) were analysed using modern light-curve synthesis methods. Large asymmetries in the light curves may be explained in terms of a dark starspot on the primary component ...
Erdem, A. +2 more
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The Astronomical Journal, 2023 High-precision light curves were extracted from TESScut images. Together with APOGEE and LAMOST medium-resolution spectra, a joint study was made for six early K-type contact binary candidates selected unbiasedly with orbital periods around 0.268 day. It
N.-P. Liu +4 more
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Contact-binary Evolution with Energy Transfer and Saturated Magnetic Braking
The Astrophysical JournalThe evolution of low-mass contact binaries is influenced by angular momentum loss, mass and energy transfer (ET), and the nuclear evolution of the components.
Matthias Fabry, Andrej Prša
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X-Ray and UV Observations of the Contact Binary KIC 9832227
The Astronomical Journal, 2023 We investigate the X-ray and UV emission from the contact binary star KIC 9832227, which was observed with XMM-Newton for one orbital cycle. The binary is detected with an average X-ray luminosity of 3.4 × 10 ^30 erg s ^−1 .
Dirk Pandel, Lawrence A. Molnar
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