Period Changes and Four-color Light Curves of Active Contact Binary VW Bootis

Details Period Changes and Four-color Light Curves of Active Contact Binary VW Bootis Period Changes and Four-color Light Curves of Active Contact Binary VW Bootis

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aj....141..147l&link_type=abstract

The Astronomical Journal, Volume 141, Issue 5, article id. 147 (2011).

Astronomy and Astrophysics

Astronomy

Binaries: Close, Binaries: Eclipsing, Stars: Evolution, Stars: Individual: Vw Bootis

Scientific paper

The secured four-color light curves of VW Boo were analyzed with the 2003 version of the Wilson-Devinney code. It is confirmed that VW Boo is a shallow W-type contact binary system with a degree of contact factor f = 10.8%(± 0.5%). Two dark spots were found on the massive cool component this time. They cause an unequal depth of the two maxima. A period investigation based on all available visual, photographic, CCD, and photoelectric data shows that the period of the system includes a long-term decrease (dP/dt = -1.454 × 10-7 days yr-1) and an oscillation (A 3 = 0.0059 days T 3 = 25.96 years). These may be caused by mass transfer, angular momentum loss, and cyclic magnetic activity.

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