Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...234..284g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 234, no. 1-2, Aug. 1990, p. 284-298. Research supported by Leverhulme Trust.
Astronomy and Astrophysics
Astrophysics
33
Astronomical Spectroscopy, Auriga Constellation, Chromosphere, Eclipsing Binary Stars, Stellar Atmospheres, Absorption Spectra, High Resolution, Stellar Rotation, Supergiant Stars
Scientific paper
High S/N, high-resolution observations of Zeta Aur which were made at optical wavelengths during its 1987 ingress and total eclipse are presented. The spectra have been analyzed by spectral subtraction, enabling the spectra of the B star and of the K supergiant chromosphere to be isolated for the first time in the wavelength region 3650-4650 A. Over 260 absorption features believed to originate in the supergiant's chromosphere have been identified. Determinations of the masses, sizes and relative velocity of the component stars are used to construct a model of the geometry of the eclipse. If the lower chromosphere rotates rigidly with the supergiant, its radial velocity measured at ingress indicates a rotation period that may be synchronous with the orbital period of the system.
Griffin Elizabeth M. R.
Griffin Roger F.
Reimers Dieter
Schroeder Klaus-Peter
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