Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980esasp.157..223f&link_type=abstract
The second European International Ultraviolet Explorer (IUE) Conference, held 26-28 March 1980 in Tübingen, West Germany. Edited
Astronomy and Astrophysics
Astronomy
2
Absorption Spectra, Eclipsing Binary Stars, Emission Spectra, Giant Stars, Iue, K Stars, Ultraviolet Astronomy, Auriga Constellation, B Stars, Interstellar Gas, Late Stars, Metal Ions, Stellar Coronas
Scientific paper
High resolution IUE spectra of Zeta Aur were obtained near orbital phase 0.91, covering the 1175 to 3000 A region. The spectral type of the B companion is estimated as B7 V from its energy distribution, which gives Te = 12000 K, and the strength of Si (III) lines. The absorption profiles of the strong lines are complex, indicating the presence of several components. High excitation features like the resonance lines of N (V), C (IV) and Si (IV) and lambda 1640 He (II) are present in absorption. These features are generally not present in late 8 main sequence stars. These observations suggest that the corona of the K star has extension at least double that derived from visual observations, with both low and high excitation features and a structure made of small condensations expanding outward.
Faraggiana Rosanna
Hack Margherita
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