A&A Supplement series, Vol. 122, May I 1997, 515-519
Received April 2; accepted August 21, 1996
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 
. 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.
keywords: stars: HL Aur -- binaries: eclipsing