Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pasp...95..364g&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 95, June 1983, p. 364-367.
Astronomy and Astrophysics
Astronomy
Astronomical Spectroscopy, Eclipsing Binary Stars, Giant Stars, H Alpha Line, Oxygen Spectra, Stellar Spectrophotometry, Electrophotometry, Emission Spectra, K Stars, Line Spectra, Stellar Evolution, Stellar Spectra
Scientific paper
Observations of the 36.57-day eclipsing binary SX Cas made on eight nights during February and March 1979 with pairs of intermediate- and narrow-band filters centered on the wavelengths of the Balmer H-alpha line and the O I 7774 A triplet are discussed. In addition, a reticon spectrum covering a wavelength range of 4750 A to 7700 A was obtained in September 1979, showing strong H-beta and H-alpha emission lines as well as absorption features of the K-giant component of the system. From the photometry, strong H-alpha emission is found at all the orbital phases sampled. However, no appreciable O I 7774 A line emission is detected. It is noted that the strong H-alpha emission is consistent with the presence of significant amounts of circumstellar and circumbinary gas. From the observations, it appears that the H-alpha emitting region is centered chiefly on the primary component, but the gas is partially eclipsed by the larger cool giant during primary eclipse. The H-alpha-emitting region therefore appears larger than the dimensions of the stellar components. In addition, the apparent nonrepeatability of the H-alpha emission strength from one orbital cycle to the next implies that relatively rapid changes in the extent or quantity of gas occur in the system.
Guinan Edward F.
Tomczyk Steve
Turnshek D. J.
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