Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pasp...98..389l&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 98, April 1986, p. 389-402.
Astronomy and Astrophysics
Astronomy
20
Absorption Spectra, Eclipsing Binary Stars, Stellar Spectra, Supergiant Stars, Line Spectra, Stellar Evolution, Stellar Mass, Stellar Mass Ejection
Scientific paper
Optical high-resolution 2.7-m McDonald Observatory observations of Epsilon Aur obtained during the 1982-1985 eclipse are discussed, with focus on the K I resonance lines, some Fe II and Ti II lines in the blue, and the near-infrared N I excitation lines. The N I lines are immune to contamination by the secondary, and their radial velocity decline over the three-year interval fits the predicted velocity curve. The 7664 A and 7699 A K I lines strengthen greatly during the eclipse due to gas in orbit around the secondary passing in front of the primary, and the velocity pattern analysis indicates a mass of the secondary to solar mass ratio of between about 3 and 6 and a primary mass of 3 solar masses. The data are consistent with the picture of a low-mass post-AGB primary having lost mass through a wind and by Roche-lobe transfer to the secondary, and which will evolve to a white dwarf in less than 10,000 years.
Lambert David L.
Sawyer S. R.
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