Regularities in the frequency spacings of Delta Scuti stars and the s-f Diagram

Author(s)
Michel Breger, Patrick Lenz, Aleksiej Pamiatnych
Abstract

Statistical analyses of several ? Scuti stars (FG Vir, 44 Tau, BL Cam and others) show that the photometrically observed frequencies cluster around the frequencies of the radial modes over many radial orders. The observed regularities can be partly explained by modes trapped in the stellar envelope. This mode selection mechanism was already proposed by Dziembowski & Krolikowska (1990) and was shown to be efficient for l = 1 modes. New pulsation model calculations confirm the observed regularities. We present the s-f diagram, which compares the average separation of the radial frequen- cies (s) with the frequency of the lowest unstable radial mode (f ). The diagram provides an estimate for the log g value of the observed star, if we assume that the centers of the observed frequency clusters correspond to the radial mode frequencies. This assumption is confirmed by examples of well-studied ? Scuti variables in which radial modes were definitely identified.

Organisation(s)
Department of Astrophysics
Journal
Communications in Asteroseismology
Volume
157
Pages
56-61
No. of pages
6
ISSN
1021-2043
Publication date
2008
Peer reviewed
Yes
Austrian Fields of Science 2012
103004 Astrophysics, 103003 Astronomy
Portal url
https://ucrisportal.univie.ac.at/en/publications/4cb8280a-aef6-42fd-b19b-e6412991e0a1