Photometric Mode Identification in the two Doradus stars HD 12901 and HD 48501

C. Aerts1, J. Cuypers2, M.A. Dupret3,4, R. Garrido4, J. De Ridder1, L. Eyer5
1 Institute of Astronomy, University of Leuven, Belgium
2 Royal Observatory, Brussels, Belgium
3 Institut d'Astrophysique et Géophysique, Université de Liège, Belgium
4 Instituto de Astrofisica de Andalucia, Granada, Spain
5 Department of Astrophysical Sciences, Princeton University, USA

 

The Doradus stars constitute a relatively new class of pulsating main-sequence stars. They exhibit gravity-mode oscillations with periods of the order of a day. As the number of well-established members is still scarce, and as details of the origin of the pulsations are not yet understood, much observational effort is currently undertaken to constrain their pulsational character and their position in the HR diagramme (see also poster by Mathias et al., this conference).
Recently, Eyer & Aerts (2000) have undertaken a search for new Doradus stars in the Geneva photometric database, resulting in three new members of the class. In this poster, we perform mode identification based on multicolour Geneva photometry of all the modes detected in the data of two of these stars, namely HD 12901 and HD 48501. A frequency search leads to three frequencies in each of the stars.
The identification of the oscillation modes is based upon the method presented by Dupret et al. (this conference) and takes into account non-adiabatic effects in the outer atmosphere. It is the first time that such detailed mode identification effort is possible in Doradus stars, as high-quality multicolour data with a sufficient time base are scarce for these objects.

 
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