EDP Sciences
Free access
Volume 401, Number 1, April I 2003
Page(s) 281 - 288
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20030086

A&A 401, 281-288 (2003)
DOI: 10.1051/0004-6361:20030086

Spectroscopic mode identification for the slowly pulsating B star HD 147394

M. Briquet1, C. Aerts2, P. Mathias3, R. Scuflaire1 and A. Noels1

1  Institut d'Astrophysique et de Géophysique de Liège, Université de Liège, allée du Six Août 17, 4000 Liège, Belgium
2  Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200 B, 3001 Leuven, Belgium
3  Observatoire de la Côte d'Azur, Département Fresnel, UMR 6528, 06304 Nice Cedex 4, France

(Received 27 November 2002 / Accepted 15 January 2003 )

We present ground-based high-resolution high S/N spectra of the slowly pulsating B star HD 147394. Two frequencies are clearly found in the moments of the Si II 4128-4130 doublet: f1=0.8008 c d -1 and f2=0.7813 c d -1. The frequency  f1 is also found in the HIPPARCOS data. A third frequency is also present in our spectroscopic data: f3=0.7175 c d -1 or its aliases due to the time sampling. A mode identification is performed by means of a new version of the moment method optimized for multiperiodic signals. It points towards several equivalent solutions of non-axisymmetric $\ell \le 3$ for all three modes. We have too limited information to perform seismic modelling at this stage, but we do show that the different possibilities for the mode identifications are compatible with pulsational models for SPBs.

Key words: line: profiles -- stars: early-type -- stars: oscillations -- stars: rotation -- stars: variables: general -- stars: individual: HD 147394

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

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