EDP Sciences
Free Access
Volume 398, Number 2, February I 2003
Page(s) 687 - 696
Section Stellar atmospheres
DOI https://doi.org/10.1051/0004-6361:20021683

A&A 398, 687-696 (2003)
DOI: 10.1051/0004-6361:20021683

A new version of the moment method, optimized for mode identification in multiperiodic stars

M. Briquet1 and C. Aerts2

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 200B, 3001 Leuven, Belgium

(Received 26 September 2002 / Accepted 12 November 2002 )

We present a numerical version of the moment method for the identification of non-radial pulsation modes. The new version requires less computation time than the previous one, allowing users to consider all the information contained in the first three moments of a multiperiodic star and to identify multiple modes simultaneously. This, together with the use of a new discriminant that considers the moments calculated at each time of observation, increases considerably the feasibility and the accuracy of the mode identification for multiperiodic stars. Moreover, the technique is extended to rotating pulsating stars. We apply the new version to three B stars showing multiperiodicity.

Key words: line: profiles -- stars: oscillations -- stars: individual: $\beta$ Crucis, 16 Lacertae, HD 74195

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

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© ESO 2003

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