Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ap%26ss.108..383e&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 108, no. 2, Jan. 1985, p. 383-392.
Astronomy and Astrophysics
Astrophysics
7
Astronomical Catalogs, Companion Stars, Eclipsing Binary Stars, Light Curve, Peculiar Stars, Stellar Spectrophotometry, Electrophotometry, K Stars, Radiant Flux Density, Spectral Energy Distribution, Stellar Color
Scientific paper
The observations of the peculiar eclipsing binary RT Lac were continued during the observing seasons of 1982 and 1983. The salient properties of the light curves are presented. The shallowest primary eclipse was observed in 1983. When the light curves obtained in six years successively are interpreted together it is seen that the variations of the brightness at midprimary and second maximum are too similar to each other. The color variations at midprimary also follow variations in the brightness. These circumstances indicate that the starspot hypothesis is insufficient alone to explain all the phenomena observed. The earlier-spectral-type G9 companion may be intrinsically variable, and the unusual distortion on the light curves following the secondary eclipse may arise from the gas stream from the larger K star to the G9 star.
Evren Serdar
Ibanoglu Cafer
Tumer O.
Tunca Zeynel
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