Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-05-26
Astron.Astrophys. 396 (2002) 911-916
Astronomy and Astrophysics
Astrophysics
7 pages (in A&A style), 5 ps figures (Fig. 4 in colour) Accepted for A&A Main Journal
Scientific paper
10.1051/0004-6361:20021456
The line profile variations of the Delta Scuti star HD 2724=BB Phe were studied on the basis of new 189 high-resolution spectrograms covering 52 hours of observations on a baseline of 8.3 days. By combining these results with those of a previous campaign 13 pulsation modes were identified: 5 of them are both photometric and spectroscopic, 3 are purely spectroscopic and 5 purely photometric. For the first time it was possible to compare spectroscopic data taken in two different seasons: 6 modes were found to be common to both datasets and furthermore strong amplitude variations of the excited modes were detected. The fit of the line profile variations with a model of non-radial pulsating star allowed us to obtain a reasonable estimate of the inclination of the rotational axis and to propose the l,m typing of the spectroscopic modes. The frequency content resembles that of 4 CVn, a delta Sct star with similar physical parameters.
Mantegazza Luciano
Poretti Ennio
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