EDP Sciences
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Volume 366, Number 1, January IV 2001
Page(s) 121 - 128
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20000193

A&A 366, 121-128 (2001)
DOI: 10.1051/0004-6361:20000193

Optical variability of the B-type star HD 105382: Pulsation or rotation?

M. Briquet1, C. Aerts2 and P. De Cat2

1  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

(Received 18 May 2000 / 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

Offprint request: M. Briquet, briquet@astro.ulg.ac.be

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