Light curves of SZ PISCIUM for 1977 and 1978

Details Light curves of SZ PISCIUM for 1977 and 1978 Light curves of SZ PISCIUM for 1977 and 1978

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..82..289e&link_type=abstract

Astrophysics and Space Science, vol. 82, no. 2, Mar. 1982, p. 289-306.

Astronomy and Astrophysics

Astrophysics

13

Eclipsing Binary Stars, Light Curve, Main Sequence Stars, Stellar Rotation, Stellar Spectrophotometry, Brightness Temperature, Chromosphere, Roche Limit, Stellar Luminosity, Stellar Models, Stellar Temperature

Scientific paper

A nearly-complete, V-band light curve is given for the bright eclipsing binary system SZ Psc covering 1978, along with a partial light curve for 1977. A primary minimum time of JD(solar)2443823.674 + or - 0.001, and a Russel-model solution where i=75.8 deg + or - 0.1 deg, r(h)=0.096 + or - 0.003, r(c)=0.351 + or - 0.001, and L(h)=0.253 + or - 0.002, are derived from the light curve of 1978. The binary system, comprising an F5-8 main sequence star as its hotter component and a K3-4 above the main sequence as the cooler, is detached, with the larger component filling only 82% of its Roche lobe. The observed distortion wave does not migrate regularly, as in other RS CVn-type systems, but rather changes phase and amplitude erratically and has exhibited nearly constant phase in 1977 and 1978 while its amplitude decreased by a factor of three. A discussion of the implications of this behavior for the RS CVn-type activity spot model finds that HD 219018, the traditional comparison star of SZ Psc, is probably a constant star rather than a variable, as has recently been suggested.

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