Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...350..372r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 350, Feb. 10, 1990, p. 372-385.
Astronomy and Astrophysics
Astrophysics
27
Eclipsing Binary Stars, Infrared Photometry, Light Curve, Starspots, Chromosphere, Dwarf Stars, Late Stars, Subgiant Stars, Time Dependence
Scientific paper
The 1.2-micron infrared light curve of Algol has been analyzed to determine the nature of the large scatter in the observations. This scatter is the result of time-dependent changes in the depths and phases of both eclipses, and in the asymmetric shape of secondary minimum. These changes can be explained by cyclic variations in the mean temperature of the secondary and by a photometric distortion of the light curve. This type of variability is similar to that seen in the optical light curves of RS Canum Venaticorum (or RS CVn) binaries which are distorted by the motions of starspots on the chromospherically active K-type secondaries in these systems. The discovery of similar photometric distortions in the 1.2-micron light curve of Algol provides evidence of starspot activity. In particular, this activity is associated with the K2 subgiant secondary in Algol.
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