Five years of photometry of Sigma Geminorum

Details Five years of photometry of Sigma Geminorum Five years of photometry of Sigma Geminorum

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..93..305f&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 93, no. 2, June 1983, p. 305-311.

Astronomy and Astrophysics

Astrophysics

15

Binary Stars, Electrophotometry, Light Curve, Starspots, Stellar Spectrophotometry, Ubv Spectra, Variable Stars, Ephemerides, Minima, Orbital Elements, Stellar Flares, Stellar Magnitude, X Ray Sources

Scientific paper

Thirteen observatories have collaborated in obtaining five years of photoelectric photometry for the bright, K1 III RS CVn binary Sigma Geminorum. Except for one year, the light curve has exhibited two minima which are separated by approximately half a cycle. At the 1977.2 epoch of discovery one minimum was shallower, but as of 1982.2 they have become comparable in depth. During the 1979-80 season, the light curve changed shape rapidly, with the shallower minimum becoming as deep as the other within a period of no more than 80 days. The overall brightness range during the five years in V has been 4.13-4.29 mag, and it is found that the times of both minima can be fit with a photometric period of 19.423 days.

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