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

Autor(en)

Michel Breger, Patrick Lenz, Aleksiej Pamiatnych

Abstrakt

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(en)

Institut für Astrophysik

Journal

Communications in Asteroseismology

Band

157

Seiten

56-61

Anzahl der Seiten

6

ISSN

1021-2043

Publikationsdatum

2008

Peer-reviewed

Ja

ÖFOS 2012

103004 Astrophysik, 103003 Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/4cb8280a-aef6-42fd-b19b-e6412991e0a1