A study of the periods of the active binary AR Lac

Authors
Qian, S Liu, Q Yang, Y
Citation
S. Qian et al., A study of the periods of the active binary AR Lac, CHIN ASTR A, 23(3), 1999, pp. 317-323
Citations number
14
Categorie Soggetti
Space Sciences
Journal title
CHINESE ASTRONOMY AND ASTROPHYSICS
ISSN journal
02751062 → ACNP
Volume
23
Issue
3
Year of publication
1999
Pages
317 - 323
Database
ISI
SICI code
0275-1062(199907/09)23:3<317:ASOTPO>2.0.ZU;2-P
Abstract
The O-C curve of the RS CVn-type binary system, AR Lac, has been analyzed u sing the method of Kalimeris et al. It is shown that the orbital period of the system is modulated with a long period of 47 years and an amplitude of 1.56 x 10(-5) d, while undergoing a constant decrease. Possible physical me chanisms for the variations are investigated. The observed variations may b e caused by a combination of a magnetic activity cycle in the secondary com ponent and an orbital angular momentum loss due to magnetic braking.