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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, Shaukat Goderya, Fazeel Mahmood Khan   +2 more
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The evolution of binary stars into contact states [PDF]

Space Science Reviews, 1989
AbstractGood-quality empirical results on 62 short-period binary stars recently summarised by Hilditch & Bell (1987) and Hilditch, King & McFarlane (1988) are discussed in terms of evolutionary paths from detached to semi-detached and contact states.
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Tomographic Separation of Composite Spectra. IX. The Massive Close Binary HD 115071 [PDF]

, 2002
We present the first orbital elements for the massive close binary, HD 115071, a double-lined spectroscopic binary in a circular orbit with a period of 2.73135 +/- 0.00003 days.
C. Lloyd, Claret A., Cruz-Gonzalez C., D. J. Stickland, de Loore C., Douglas R. Gies, Harries T. J., Hilditch R. W., Howarth I. D., John H. Wise, Laura R. Penny, Lorenz R., Meurs E. J. A., Meynet G., Mochnacki S. W., Schaller G., Stickland D. J., Wade R. A.   +17 more
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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, L. Patkós, A. Moór, V. Könyves   +3 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
doaj   +1 more source

Search for Variable Stars in the Globular Cluster M3 [PDF]

, 1997
We describe here results of a photometric time-sequence survey of the globular cluster M3 (NGC 5272), in a search for contact and detached eclipsing binary stars.
Clement, C., Hilditch, R. W., Kaluzny, J., Rucinski, S. M.   +3 more
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Dynamical evolution of active detached binaries on log Jo - log M diagram and contact binary formation [PDF]

, 2006
Orbital angular momentum (Jo), systemic mass (M) and orbital period (P) distributions of chromospherically active binaries (CAB) and W Ursae Majoris (W UMa) systems were investigated.
Awadalla, Bilir, Binnendijk, Claret, Demircan, Demircan, Eggen, Eggen, Eggen, Eggen, Eggleton, Gazeas, Ghez, Guinan, Huang, Karataş, Kiseleva, Kraft, Maceroni, Maceroni, Mestel, Mestel, Mochnacki, Montes, Montes, O. Demircan, Okamoto, Paczynski, Pooley, Pribulla, Pringle, Qian, Rasio, Rucinski, Rucinski, Rucinski, S. Bilir, Schatzman, Stepien, Van't Veer, Vilhu, Wilson, Y. Karataş, Yakut, Z. Eker   +44 more
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1318 New Variable Stars in a 0.25 Square Degree Region of the Galactic Plane [PDF]

, 2010
We have conducted a deep photometric survey of a 0.5 deg x 0.5 deg area of the Galactic Plane using the WFI instrument on the 2.2-m ESO telescope on La Silla, Chile. The dataset comprises a total of 267 R-band images, 204 from a 16 day observation run in
Alard, Albrecht, Albrow, Albrow, Albrow, Bayne, Bessell, Bonnarel, Bramich, C. Afonso, Cargile, Carpenter, Christiansen, Covino, Davidge, Hebb, Irwin, Lomb, M. D. Albrow, Monet, O'Connell, Ochsenbein, Pojmanski, Rucinski, Rucinski, Rucinski, Skrutskie, Soszynski, Soszynski, Soszynski, Stassun, Stassun, Stellingwerf, Stetson, Th. Henning, V. R. Miller, Weldrake, Weldrake, Wozniak, Wyrzykowski   +39 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, L. T. Ball, E. Budding, O. B. Slee, R. T. Stewart   +4 more
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