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A Spectroscqpic Study of the Bp-Star θ Aur

Published online by Cambridge University Press:  12 April 2016

D. Kolev  and
E. Georgeva
D. Kolev
Affiliation:
National Astronomical Observatory Bulgarian Academy of Sciences P.O.Box 136 4700 Smolian, Bulgaria
E. Georgeva
Affiliation:
National Astronomical Observatory Bulgarian Academy of Sciences P.O.Box 136 4700 Smolian, Bulgaria

Abstract

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The atmosphere parameters, spectral variability and the magnetic field geometry of the Bp-star θ Aur are evaluated from 30 coude-spectrograms. We adopt Te = 10 800K and lgg = 3.40 (with lower reliability of lg g ) . The equivalent widths of the metalic lines show a relatively great scattering which troubles the period search. The best fit to our data gives the period P = 3.620d, but the variability is clearly seen only for Sill lines. The uncertainties in the star parameters obtained bring to a great uncertainty in the magnetic dipole geometry: i = 86° + 39° and β = 18° + 80°. We adopt the most plausible star parameters to be: R = 3.8R⊙ M = 3.5R⊙, i = 80°, β = 20°, Bp = 1 KGs.

Type
Section III - Magnetic CP Stars
Information
International Astronomical Union Colloquium , Volume 90: Upper Main Sequence Stars with Anomalous Abundances , 1986 , pp. 295 - 298
Copyright
Copyright © Reidel 1986

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