Line profile analysis of the Delta Scuti star HD2724=BB Phe: mode identification and amplitude variations
Abstract
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.
Keywords
Cite
@article{arxiv.astro-ph/9905326,
title = {Line profile analysis of the Delta Scuti star HD2724=BB Phe: mode identification and amplitude variations},
author = {Luciano Mantegazza and Ennio Poretti},
journal= {arXiv preprint arXiv:astro-ph/9905326},
year = {2009}
}
Comments
7 pages (in A&A style), 5 ps figures (Fig. 4 in colour) Accepted for A&A Main Journal