New BVR photometry of six prominent RS Canum Venaticorum binaries

Details New BVR photometry of six prominent RS Canum Venaticorum binaries New BVR photometry of six prominent RS Canum Venaticorum binaries

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26as..138..203p&link_type=abstract

Astronomy and Astrophysics Supplement, v.138, p.203-211

Astronomy and Astrophysics

Astrophysics

15

Stars: Variables, Stars: Binaries: Close Stars: Activity, Stars: Chromosphere, Starspots

Scientific paper

A new BVR photometry of six prominent RS CVn stars: V711 Tau, UX Ari, IM Peg, II Peg, sigma Gem and lambda And, carried out during 1995-97, is presented. The new results reveal significant evolution in the shape as well as in the amplitude of light curves of these binaries. The traditional two-starspot model has been used to obtain the spot parameters from the observed light curves of the stars. Changes in spot area and their location on stellar surface can be noticed from extracted spot parameters. Some of these stars are found to have significant variation in (B-V) and (V-R) colour indices. The (V-R) colour index variation found in IM Peg, II Peg and lambda And have been used for determining starspot effective temperatures.

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