A study of the periods of the active binary AR Lac

Details A study of the periods of the active binary AR Lac A study of the periods of the active binary AR Lac

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999cha%26a..23..317q&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 23, Issue 3, p. 317-323.

Astronomy and Astrophysics

Astrophysics

8

Scientific paper

The O-C curve of the RS CVn-type binary system, AR Lac, has been analyzed using 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 × 10-5 d, while undergoing a constant decrease. Possible physical mechanisms for the variations are investigated. The observed variations may be caused by a combination of a magnetic activity cycle in the secondary component and an orbital angular momentum loss due to magnetic braking.

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