Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.281a.213a&link_type=abstract
In ESA, A Decade of UV Astronomy with the IUE Satellite, Volume 1 p 213-215 (SEE N89-10682 01-89)
Astronomy and Astrophysics
Astronomy
5
Eclipses, Eclipsing Binary Stars, Iue, Spaceborne Astronomy, Ultraviolet Astronomy, Ultraviolet Spectra, Mass Transfer, Stellar Atmospheres, Stellar Envelopes, Stellar Mass
Scientific paper
It is confirmed that HR 2554 (G6 II + A0 V) is an atmospheric eclipsing system of the zeta-Aur type. The IUE observations of the Nov. 1987 eclipse indicate that the eclipse of the A star lasts 4 days and is not total. Absorption lines due to the extended atmosphere of the primary can be seen a day before and after the eclipse and are missing 2 days from first and 4th contact. Thus the outer envelope of the primary extends to less than 1 stellar radius beyond the photosphere. Compared to 22 Vul (G3 Ib-II + B9 V), where the absorption can be traced to a few stellar radii, HR 2554 is a more moderate case of mass outflow, which implies there is reduced interaction of the secondary within the wind from the primary as is seen in the other zeta-Aur systems.
Ake Thomas B. III
Parsons Sidney B.
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