Photometric analyses of S CANCRI

Details Photometric analyses of S CANCRI Photometric analyses of S CANCRI

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90..504e&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 90, March 1985, p. 504-514.

Astronomy and Astrophysics

Astronomy

18

Binary Stars, Electrophotometry, Hot Stars, Light Curve, Stellar Spectrophotometry, Absorption Spectra, Abundance, Orbital Elements, Roche Limit, Spectral Energy Distribution, Stellar Color, Stellar Temperature

Scientific paper

Photometric solutions are made on several photoelectric light curves of S Cancri previously published by Crawford and Olson (1980). Two widely independent methods are employed to give adopted equivalent volume radii of rA = 0.0860 and rB = 0.1880, and an orbital inclination of i = 85.31 deg. Spectrophotometric observations are presented and analyzed to give revised spectral classifications of B9.5 V and G8 to K0 III and temperatures of TA = 10,500 K and TB = 4750 to 4500 K for the components. The cool Roche-lobe-filling secondary exhibits changes in color with phase due to oblateness and reflection. Anomalous photometric behavior is correlated with changes in a nonstellar Ca II K-line absorption feature that suggests the presence of an extended atmosphere around the cool mass-losing component. This is a phenomenon never before noted in Algol-type binaries.

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