Starspot modeling of ten years of photometry of the long-period RS CVn binary Sigma Geminorum

Details Starspot modeling of ten years of photometry of the long-period RS CVn binary Sigma Geminorum Starspot modeling of ten years of photometry of the long-period RS CVn binary Sigma Geminorum

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...192..135s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 192, no. 1-2, March 1988, p. 135-146.

Astronomy and Astrophysics

Astrophysics

26

Binary Stars, Starspots, Stellar Atmospheres, Stellar Spectrophotometry, Ubv Spectra, Variable Stars, Computer Programs, High Resolution, Line Spectra, Lyman Alpha Radiation, X Ray Sources

Scientific paper

The authors present new UBV photometry of the long period (Porb = 19.6 days) RS CVn binary σ Gem made between 1981 and 1986 at 22 different observatories. Together with earlier data presented by Fried et al. (1983), σ Gem has now been monitored since the discovery of its light variability in 1977. With these ten years of differential photometry in hand the authors investigate the long-term spot behavior with a standard spot-modeling computer program. They found a cyclic variation of the total spotted area with a period of ≈2.7 yr, a maximum spot coverage of 12% in 1986, a maximum wave amplitude of 0.15 mag in 1984, and mean colors which are not entirely consistent with the K1 III spectral classification. From the spot-migration rate the authors derived a more recent photometric period of 19.410 days. They also discuss some anomalies in the spot motions which occurred between 1984 and 1985.

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