Issue |
Astron. Astrophys. Suppl. Ser.
Volume 138, Number 2, August 1999
|
|
---|---|---|
Page(s) | 203 - 211 | |
DOI | https://doi.org/10.1051/aas:1999272 | |
Published online | 15 August 1999 |
New BVR photometry of six prominent RS Canum Venaticorum binaries
School of Studies in Physics, Pt. Ravishankar Shukla University, Raipur, 492 010, India
Send offprint request to: S.K. Pandey
Received:
16
January
1998
Accepted:
16
April
1999
A new BVR photometry of six prominent RS CVn stars: V711 Tau, UX Ari, IM
Peg, II Peg, σ Gem and λ 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
() and (
) colour indices. The (
) colour index variation found in
IM Peg, II Peg and λ And have been used for determining starspot
effective temperatures.
Key words: stars: variables / stars: binaries: close stars: activity / stars: chromosphere / starspots
© European Southern Observatory (ESO), 1999