Photometric solutions of three eclipsing binary stars observed from Dome A, Antarctica

• Published in: The Astronomical Journal
• Main Authors: Liu, N., Fu, J. N., Zong, W., Wang, L. Z., Uddin, S. A., Zhang, X. B., Zhang, Y. P., Cang, T. Q., Li, G., Yang, Y., Yang, G. C., Mould, J., Morrell, N.
• Other Authors: Swinburne University of Technology
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: American Astronomical Society 2018
• Subjects: Antarctic; Antarc*; Antarctica
• Online Access: http://hdl.handle.net/1959.3/443053; https://doi.org/10.3847/1538-3881/aab266

Based on spectroscopic observations for the eclipsing binaries CSTAR 036162 and CSTAR 055495 with the WiFeS/2.3 m telescope at SSO and CSTAR 057775 with the Mage/Magellan I at LCO in 2017, stellar parameters are derived. More than 100 nights of almost-continuous light curves reduced from the time-series photometric observations by CSTAR at Dome A of Antarctic in i in 2008 and in g and r in 2009, respectively, are applied to find photometric solutions for the three binaries with the Wilson-Devinney code. The results show that CSTAR 036162 is a detached configuration with the mass ratio q = 0.354 +/- 0.0009, while CSTAR 055495 is a semi-detached binary system with the unusual q = 0.946 +/- 0.0006, which indicates that CSTAR 055495 may be a rare binary system with mass ratio close to one and the secondary component filling its Roche Lobe. This implies that a mass-ratio reversal has just occurred and CSTAR 055495 is in a rapid mass-transfer stage. Finally, CSTAR 057775 is believed to be an A-type W UMa binary with q = 0.301 +/- 0.0008 and a fill-out factor of f = 0.742(8).