An abnormal radiant luminosity of the contact binary GZ Andromedae and
its possible explanation

YL, Yang; QY, Liu

doi:10.1051/0004-6361:20030061

Cited by 9 publications

(3 citation statements)

References 22 publications

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“…1) we can easily say that the data available to Milano et al (1989) have not sufficient coverage in time to determine exact character of the quadratic change. Under the assumption of conservative mass transfer one can also estimate the rate of change of the mass ratio using the formulation given by Yang & Liu (2003). We calculated the rate of change of mass ratio for TT Her due to the mass transfer in the system as dq/dt = 3.58 × 10 −8 yr −1 .…”

Section: Results and Conclusionmentioning

confidence: 99%

Orbital period variation of the eclipsing binary system TT Herculis

Selam

Albayrak

2007

Astron Nachr

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New photoelectric UBV observations were obtained for the eclipsing binary TT Her at the Ankara University Observatory (AUO) and three new times of minima were calculated from these observations. The (O − C) diagram constructed for all available times of minima of TT Her exhibits a cyclic character superimposed on a quadratic variation. The quadratic character yields an orbital period decrease with a rate of dP/dt = −8.83 × 10 −8 day yr −1 which can be attributed to the mass exchange/loss mechanism in the system. By assuming the presence of a gravitationally bound third body in the system, the analysis of the cyclic nature in the (O − C) diagram revealed a third body with a mass of 0.21 M orbiting around the eclipsing pair. The possibility of magnetic activity cycle effect as a cause for the observed cyclic variation in the (O − C) diagram was also discussed.

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Section: Results and Conclusionmentioning

confidence: 99%

Orbital period variation of the eclipsing binary system TT Herculis

Selam

Albayrak

2007

Astron Nachr

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“…In case of conservative mass transfer one can also estimate the rate of change of the mass ratio using the formulation given by Yang & Liu (2003) as…”

Section: Conclusion and Final Remarksmentioning

confidence: 99%

“…where P/P is the rate of the period change in yr −1 and M 1 and M 2 are the masses of the losing and the gaining components in solar mass, respectively. In case of conservative mass transfer one can also estimate the rate of change of the mass ratio using the formulation given by Yang & Liu (2003) as…”

Section: Conclusion and Final Remarksmentioning

confidence: 99%

A Period Study of the Close Binary V508 Ophiuchi

Albayrak

2005

Publ. – Astron. Soc. Aust

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Abstract:The short-period (0 d .34) close binary V508 Oph was observed in 2005 and four new times of minima were derived. All of the available times of minima, including the new ones, covering 69 years were analyzed. It was shown that the period change of the system is very complex. Two possible period oscillations with periods of 24.73 and 9.91 years and amplitudes of about 0.011 and 0.002 day, respectively, were found to superimpose on upward parabolic change, indicating a secular period increase at a rate of dp/dt = 4.24 × 10 −9 days yr −1 . The mechanisms that could explain the period changes of the system are discussed.

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Light curve solution and orbital period analysis of the contact binary V842 Herculis

Selam¹,

Albayrak²,

Şenavcı³

et al. 2005

Astron. Nachr.

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Abstract. New photoelectric BV light curves were obtained for the neglected eclipsing binary V842 Her at the TÜBİTAK National Observatory (TUG) and studied for the first time in detail to determine the orbital parameters and geometry of the system. The solutions obtained simultaneously for the new light curves and the radial velocity curves in the literature by using the Wilson-Devinney code reveal a typical W-type contact system. The light curves exhibit the so-called O'Connell effect which the level of the primary maxima being higher than that of the secondary ones in both pass-bands. The O'Connell effect in the light curves is explained in terms of a dark-spot located on the more massive component which makes the more massive larger component slightly cooler than the less massive smaller one. The O − C diagram constructed for all available times of minima of V842 Her exhibits a cyclic character superimposed on a quadratic variation. The quadratic character yields a orbital period increase with a rate of dP/dt = 7.76 × 10 −7 days yr −1 which can be attributed to the mass exchange/loss mechanism in the system. By assuming the presence of a gravitationally bound third body in the system, the analysis of the cyclic nature in the O − C diagram revealed a third body with mass of 0.4M orbiting around the eclipsing pair. The possibility of magnetic activity cycle effect as a cause for the observed cyclic variation in the O − C diagram was also discussed.

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An abnormal radiant luminosity of the contact binary GZ Andromedae and its possible explanation

Cited by 9 publications

References 22 publications

Orbital period variation of the eclipsing binary system TT Herculis

Orbital period variation of the eclipsing binary system TT Herculis

A Period Study of the Close Binary V508 Ophiuchi

Light curve solution and orbital period analysis of the contact binary V842 Herculis

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