Informace o publikaci

LUT REVEALS A NEW MASS-TRANSFERRING SEMI-DETACHED BINARY

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QIAN Sheng-Bang ZHOU X. ZHU Li-Ying ZEJDA Miloslav SOONTHORNTHUM B. ZHAO E.-G. ZHANG Jia ZHANG B. LIAO W.-P.

Rok publikování 2015
Druh Článek v odborném periodiku
Časopis / Zdroj Astronomical Journal
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
Doi http://dx.doi.org/10.1088/0004-6256/150/6/193
Obor Astronomie a nebeská mechanika, astrofyzika
Klíčová slova binaries: close; binaries: eclipsing; stars: evolution; stars: individual (GQ Dra)
Popis GQ Dra is a short-period eclipsing binary in a double stellar system that was discovered by Hipparcos. Complete light curves in the UV band were obtained with the Lunar-based Ultraviolet Telescope in 2014 November and December. Photometric solutions are determined using the W-D (Wilson and Devinney) method. It is discovered that GQ Dra is a classical Algol-type semi-detached binary where the secondary component is filling the critical Roche lobe. An analysis of all available times of. minimum light suggests that the orbital period is increasing continuously at a rate of (P)over dot = +3.48(+/- 0.23) x 10(-7) days yr(-1). This could be explained by mass transfer from the secondary to the primary, which is in agreement with the semi-detached configuration with a lobe-filling secondary. By assuming a conservation of mass and angular momentum, the mass transfer rate is estimated as (m)over dot = 9.57(+/- 0.63) x 10(-8)M(circle dot) yr(-1). All of these results reveal that GQ Dra is a mass-transferring semi-detached binary in a double system that was formed from an initially detached binary star. After the massive primary evolves to fill the critical Roche lobe, the mass transfer will be reversed and the binary will evolve into a contact configuration with two sub-giant or giant component stars.
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