Fast Rotators Rotational Profile with Asymetric Splittings
Abstract
The influence of rotation on the splittings of the eigenmode frequencies strongly depends on the nature of the modes. The observed -purely acoustic- modes for the sun are mainly sensitive to rotation in the external layers. Thus they are poorly adapted to obtain the rotational profile in the deep interior of the star from inversion. However more massive and evolved stars -still on the main sequence- show mixed modes enabling rotational inversion near the core. The first step of this study is to find the ``ideal star'' i.e. to determine the range of mass and other stellar parameters as well as the evolution stages of the stars showing these modes in the range of frequencies excited by turbulent convection. The second step consists in inverting the rotational profile for such a star with simulated data and determine how deep we can extract the rotation rate depending on the star and the available modes. A further point will be to recover the rotational profile in the case of fast rotators (more massive stars) presenting asymetric splittings. This work participates to the preparation of the forthcoming space experiments COROT and Eddington and to their scientific return
- Publication:
-
IAU Joint Discussion
- Pub Date:
- 2003
- Bibcode:
- 2003IAUJD..12E..25L