Free Access
Astron. Astrophys. Suppl. Ser.
Volume 118, Number 3, September 1996
Page(s) 453 - 459
Published online 15 September 1996
BL Eridani: An unstable W Ursae Majoris system with spotted components DOI: 10.1051/aas:1996211

Astronomy and Astrophysics Supplement Series, Vol. 118, September 1996, 453-459

BL Eridani: An unstable W Ursae Majoris system with spotted components

Qingyao Liu , B. Soonthornthum , Yulan Yang , Shenghong Gu , S. Niparugs , M.L. Aniwat Sooksawat , Bi Wang and M. Naksata

Send offprint requests to: Qingyao Liu

Yunnan Observatory, Academia Sinica, Kunming, China
United Laboratory for Optical Astronomy, Chinese Academy of Sciences, China
Department of Physics, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand

Received August 25, 1995; accepted January 30, 1996


New complete BV light curves of BL Eri are presented. Light-curve variability and asymmetry are seen in both B and V bands, and the observed times of light minimum indicate period changes. The light curves have been analyzed by using the light-curve-synthesis method. Our photometric solution reveals that BL Eri is a contact binary with a common convective envelope. An examination of the available photometric and spectroscopic data indicates that the light-curve variability may be due to changes of the component radii and the light-curve asymmetry may be consistent with starspot activity on one or both components.

Key words: stars: binaries: close binaries: individual: BL Eri

Copyright EDP Sciences

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