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A&A Supplement series, Vol. 122, May I 1997, 515-519

Received April 2; accepted August 21, 1996

HL Aurigae: A near-contact binary system

R.X. Zhang, M.J. Fang, - D.S. Zhai

Send offprint request: R.X. Zhang
Beijing Astronomical Observatory, Chinese Academy of Sciences, Beijing 100080, China


Photoelectric observations of HL Aur were carried out with the 60 cm reflector of Beijing Astronomical Observatory in 1990 and 1994, and the first photoelectric BV light curves were obtained along with a newly derived ephemeris. The period of the system appears to be constant over the past 65 years. Using the Wilson-Devinney program a photometric analysis of the B and V light curves is performed. It is evident that HL Aur is a near-contact binary with a mass ratio of tex2html_wrap_inline975. The primary component of the system is essentially in contact with its Roche lobe, while the secondary is detached but nearly in contact with its lobe. It is found that the components of the system are slightly evolved and located near the terminal-age main sequence. The binary is consistent with the general evolutionary picture for near-contact systems.gif

keywords: stars: HL Aur -- binaries: eclipsing

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