Volume 366, Number 1, January IV 2001
|Page(s)||121 - 128|
|Section||Interstellar and circumstellar matter|
|Published online||15 January 2001|
Optical variability of the B-type star HD 105382: Pulsation or rotation?*
Institut d'Astrophysique et de Géophysique de Liège, Université de Liège, avenue de Cointe 5, 4000 Liège, Belgium
2 Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200 B, 3001 Heverlee, Belgium
Corresponding author: M. Briquet, firstname.lastname@example.org
Accepted: 26 October 2000
We present ground-based multi-colour Geneva photometry and high-resolution high S/N spectra of the variable B-type star HD 105382. We provide evidence that this star is not a Be star, as indicated in the literature. The monoperiodic variability found in the Hipparcos data is confirmed in our ground-based follow-up observations. All existing data give rise to the detection of the period of 1.295 days. We try to interpret the variability of the star in terms of a non-radial g-mode pulsation model and of a rotational modulation model. None of these two is able to explain the observed line-profile variations in full detail.
Key words: stars: early-type / stars: variables: general / stars: oscillations / stars: individual: HD 105382
© ESO, 2001
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