Spots on RS CVn from spectroscopy and photometry

Details Spots on RS CVn from spectroscopy and photometry Spots on RS CVn from spectroscopy and photometry

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106.1181e&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 106, no. 3, p. 1181-1190.

Astronomy and Astrophysics

Astronomy

25

Starspots, Stellar Spectrophotometry, Subgiant Stars, Light Curve, Radial Velocity

Scientific paper

We have used contemporaneous spectra and V light curves to form spot models for RS CVn in 1991 and 1992. More than two spots are needed to fit all the properties of the observations. In fact, moderately small spots (22 x 28 deg in latitude and longitude) having only a slight effect on the rotational light curve were eclipsed in both years, and we find that a collection of 6-8 such moderate spots is required to fit the line profiles in each year. These groups of spots also account naturally for a difference in level of light between the two years. There is no evidence for polar spots larger than 18 degrees in radius. We have also derived new orbits from radial velocities of the stars, which give the mass ratio Mc/Mh = 1.04 +/-0.02.

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