Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...136...31v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 136, no. 1, July 1984, p. 31-36.
Astronomy and Astrophysics
Astrophysics
13
A Stars, Magnetic Stars, Metallic Stars, Peculiar Stars, Stellar Models, Stellar Atmospheres, Stellar Composition, Stellar Evolution, Stellar Mass, Stellar Rotation, Stellar Spectrophotometry, Stellar Structure, Stellar Temperature
Scientific paper
New spectrophotometric and spectroscopic data for θ Aur are used together with data from the literature to derive t ≅ 2×108 yr, M ≅ 3.5 M_sun;, R ≅ 4.5 R_sun;, log g ≅ 3.30, Teff ≅ 10,500K, overabundances of Si(×8), Fe(×13), Cr(×65) and an underabundance of He(×1/35). Thus θ Aur is near the end of its main-sequence life. The authors propose that it is an oblique rotator whose rotation axis is seen under an angle of ≅50°. The polar axis of the magnetic field, whose strength is of the order of 1 kG, is inclined over ≅75° to the rotation axis. Metals are concentrated towards the magnetic equator (chromium, possibly silicon) or towards negative polarities (iron).
Adelman Saul J.
Hensberge Herman
van Rensbergen Walter
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