Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985cha%26a...9..316t&link_type=abstract
Chinese Astronomy and Astrophysics, Volume 9, Issue 4, p. 316-321.
Astronomy and Astrophysics
Astrophysics
1
Scientific paper
Epsilon Aurigae was observed in Mar., Aug., 1983 and Jan., Mar., 1984 with Reticon at coudé focus of the McDonald 2.7m and 2.1m telescopes. Fifty-six observations were taken over eight nights during 2nd to 4th contact.
The Hα shows noticeable variations in profile, radial velocity, and equivalent width of both absorption and emission components. A similar phenomenon was detected during the corresponding phase of the 1955 - 1957 eclipse.
A model is proposed, in which the primary is a FO supergiant surrounded by a thin ring (or disk) of radius R = 450Rsolar and rotating at velocity Vsini = 60 - 70 km s-1. This is the major source of the Hα emission component. The secondary is a type B star surrounded by a very extended envelope (R = 1000 Rsolar) and its rotational speed is similar to that of the ring of the primary. The B star heats a portion of the envelope comparable in size with the primary with enough hydrogen atoms in the lowest excited states, which cause the absorption of the emission from the primary.
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