Photometry and spectroscopy of the RS CVn system sigma Geminorum.

Details Photometry and spectroscopy of the RS CVn system sigma Geminorum. Photometry and spectroscopy of the RS CVn system sigma Geminorum.

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26as..137..217z&link_type=abstract

Astronomy and Astrophysics Supplement, v.137, p.217-221

Astronomy and Astrophysics

Astrophysics

2

Stars: Sigma Gem, Activity, Binaries: Close

Scientific paper

We present new UBV photoelectric photometry and high-resolution H_α spectroscopy of the RS CVn system sigma Gem made in 1993-1994. A brief photometric analysis for the new light curves is carried out using the Wilson-Devinney method with spot approximation based on the Roche model. The result suggests the probable presence of two cool spots on the K1 III primary around the phases of phi =0.6 and phi =0.9. The spot activity is discussed in connection with the chromospheric H_α emission. The enhanced H_α core emission is found to vary with phase and shows distinct anti-correlation with the spot regions. It may be an indication for the existence of plage regions on sigma Gem.

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