Inferring information about rotation from stellar oscillations

Autor(en)

Marie J. Goupil, Reza Samadi, Jeremie Lochard, Wojciech A. Dziembowski, Aleksiej Pamiatnych

Abstrakt

The first part of this paper briefly illustrates the intense scientific activity in the field of stellar rotation, while the second part is devoted to discussing rotation as a pertubation effect upon oscillation frequencies. The discussion focuses on one specific example: the p-modes frequency small separation which provides information about properties of the stellar inner layers. It is shown that the small separation can be affected by rotation at the level of 0.1-0.2 œHz for a 1.4M? model rotating with an equatorial velocity of 20 km/s at the surface. This is of the same order of magnitude as the expected precision on frequencies with a 3 months observation and must therefore be taken into account. We show however that it is possible to recover the small separation free of these contaminating effects of rotation, provided enough high quality data are available as will be with space seismic missions such as Eddington.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

Université de recherche Paris Sciences et Lettres, Nicolaus Copernicus University

Seiten

133-140

Anzahl der Seiten

8

Publikationsdatum

2004

ÖFOS 2012

103003 Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/df17d174-3a37-4dd3-855a-5a62c90533fc