A Spectroscopic Study of the Bp-Star θ Aur

  • D. Kolev
  • E. Georgeva
Conference paper
Part of the Astrophysics and Space Science Library book series (ASSL, volume 125)

Abstract

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= 10 800 K and lg g=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 bast fit to our data gives the period P = 3.620d, but the variability is clearly seen only for SiII 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 = 3.8 R⊙ M = 3.5 M⊙, i = 80°, β = 20°, Bp = 1 KGs.

Keywords

Oblique Rotator Spectral Variability National Astronomical Observatory Period Search Field Geometry 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© D. Reidel Publishing Company 1986

Authors and Affiliations

  • D. Kolev
    • 1
  • E. Georgeva
    • 1
  1. 1.National Astronomical ObservatoryBulgarian Academy of SciencesSmolianBulgaria

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