Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93..440p&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 93, Feb. 1987, p. 440-450.
Astronomy and Astrophysics
Astronomy
11
Cool Stars, Eclipsing Binary Stars, Stellar Envelopes, Stellar Luminosity, Stellar Spectra, Stellar Temperature, Absorption Spectra, Emission Spectra, Iue, Radiant Flux Density, Stellar Spectrophotometry, Ubv Spectra
Scientific paper
Ultraviolet spectra of the Algol-type semidetached system RY Geminorum, whose components can be described as A0 V and K0 IV, have been matched to the ultraviolet spectrum by Kurucz (1979) model atmospheres, and a best fit is found for T(eff) = 9150 K. Comparison with standard star spectra requires that this value be raised to 9400 K. The color excess of the system is determined to be no more than E(B-V) = 0.03 mag; the distance to the system is about 360 pc. The masses are approximately 2.36 and 0.38 solar masses, and the radii are 2.5 and 5.8 solar radii, respectively. The separation of the two centers is 26 solar radii. Evidence for a circumstellar line absorption is found in optical and ultraviolet spectrograms, and evidence is found in IUE spectra taken in partial eclipse for circumstellar emission lines of the type detected previously in the WS Serpentis stars and in several semidetected systems of the Algol type.
Dobias Jan J.
Plavec Mirek J.
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