Non-adiabatic oscillations of fast-rotating stars: the example of Rasalhague
Abstract
Early-type stars generally tend to be fast rotators. In these stars, mode identification is very challenging as the effects of rotation are not well known. We consider here the example of α Ophiuchi, for which dozens of oscillation frequencies have been measured. We model the star using the two-dimensional structure code ESTER, and we compute both adiabatic and non-adiabatic oscillations using the TOP code. Both calculations yield very complex spectra, and we used various diagnostic tools to try and identify the observed pulsations. While we have not reached a satisfactory mode-to-mode identification, this paper presents promising early results.
- Publication:
-
SF2A-2017: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics
- Pub Date:
- December 2017
- DOI:
- 10.48550/arXiv.1711.06053
- arXiv:
- arXiv:1711.06053
- Bibcode:
- 2017sf2a.conf..103M
- Keywords:
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- asteroseismology;
- stars:rotation;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 4 pages, 3 figures. SF2A 2017 proceedings