Optical variability of the B-type star HD 105382: Pulsation or rotation?
Abstract
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. Based on observations obtained with the Swiss photometric telescope and ESO's CAT/CES telescope, both situated at La Silla, Chile.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- January 2001
- DOI:
- 10.1051/0004-6361:20000193
- Bibcode:
- 2001A&A...366..121B
- Keywords:
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- STARS: EARLY-TYPE;
- STARS: VARIABLES: GENERAL;
- STARS: OSCILLATIONS;
- STARS: INDIVIDUAL: HD 105382