Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...251..597s&link_type=abstract
Astrophysical Journal, Part 1, vol. 251, Dec. 15, 1981, p. 597-603.
Astronomy and Astrophysics
Astrophysics
17
Eclipsing Binary Stars, Emission Spectra, K Stars, Stellar Spectra, Zeta Aurigae Star, Ferric Ions, Iue, Shock Waves, Stellar Envelopes, Ultraviolet Spectra
Scientific paper
UV observations using the IUE are employed to discuss the strength and changes of Zeta Aur between a second contact and mid-eclipse in 1979, the relative visibility of the supergiant's chromosphere as compared with the circumstellar (CS) nebular scattering of the B star photons, and the origin of the high speed CS components observed at all orbital phases. Agreement has been found for a spectoscopic radius of 200 solar radii and a 400 pc distance, and eclipse emission lines were recorded from 1238.9-2802.7 microns. An asymmetry in the Fe III lines at 46 plus or minus 15 km/sec was seen during eclipse and is taken to indicate downflowing material. The high speed wind flowing from the K supergiant is thought to expand homogeneously until encountering the B type main sequence star, where an accretion bow shock forms, and the smaller star's passage near the K star at periastron may cause local surface heating and subsequent high speed flows.
Chapman Robert Dewitt
Stencel Robert E.
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