LUT REVEALS A NEW MASS-TRANSFERRING SEMI-DETACHED BINARY

ABSTRACT 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...

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Bibliographic Details
Published in:The Astronomical journal 2015-12, Vol.150 (6), p.1-5
Main Authors: Qian, S.-B., Zhou, X., Zhu, L.-Y., Zejda, M., Soonthornthum, B., Zhao, E.-G., Zhang, J., Zhang, B., Liao, W.-P.
Format: Article
Language:English
Subjects:
ANGULAR MOMENTUM
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
binaries: close
binaries: eclipsing
BINARY STARS
CONFIGURATION
Contact
ECLIPSE
Eclipsing binary stars
Lobes
MASS TRANSFER
Photometry
ROCHE EQUIPOTENTIALS
STAR EVOLUTION
stars: evolution
stars: individual (GQ Dra)
Stellar systems
TELESCOPES
ULTRAVIOLET RADIATION
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Summary:ABSTRACT 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 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 . 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.
ISSN:0004-6256
1538-3881
1538-3881
DOI:10.1088/0004-6256/150/6/193