Light variations of RT Lac during the last ten years

Details Light variations of RT Lac during the last ten years Light variations of RT Lac during the last ten years

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ap%26ss.161..303e&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 161, no. 2, Nov. 1989, p. 303-320.

Astronomy and Astrophysics

Astronomy

9

Astronomical Photometry, Eclipsing Binary Stars, Infrared Astronomy, Light Curve, Variable Stars, Extragalactic Radio Sources, H Alpha Line, H Beta Line, Starspots

Scientific paper

The RS CVn-type eclipsing binary star RT Lac has been observed in B and V colors, during 1984, 1985, 1986, 1987, and 1988 observing seasons. The orbital period of the system was found to be decreasing with an amount of 62 s/century. The brightnesses both at minima and maxima are changing with time. It seems that the variations of the brightnesses at mid-primary and second quarter are similar, but at second first quarters are opposite to each other. It is believed that these variations are mainly related with the spots (or spot groups) located on the surface of the component star which is in front during the primary minimum. The period of the spot activity cycle to be approximately six years is also estimated.

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