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Observatoire Midi-Pyrénées |  |
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Observatoire Midi-Pyrénées | |
| HAL: hal-00288325, version 1 |
| arXiv: 0801.4630 |
| ADS Bibliographic id: 2008A&A...481..449R |
| DOI: 10.1051/0004-6361:20078075 |
| Detailed view |  Export this paper |
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| Astronomy and Astrophysics 481 (2008) 449-452 |
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| Regular patterns in the acoustic spectrum of rapidly rotating stars |
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| D. Reese 1F. Lignières 2 |
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| (2008-04) |
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| Context: Rapid rotation modifies the structure of the frequency spectrum of pulsating stars, thus making mode identification difficult. Aims: We look for new forms of organisation for the frequency spectrum that can provide a basis for mode identification at high rotation rates. Methods: Acoustic modes in uniformly rotating polytropic models of stars are computed using a numerical code that fully takes the effects of rotation (centrifugal distortion and Coriolis acceleration) into account. All low-degree modes, ? = 0 to 3, with radial orders n = 1-10 and 21-25 for N = 3 polytropic models and n = 1-10 for N = 1.5 polytropic models are followed from a zero rotation rate up to 59% of the break-up velocity. Results: We find an empirical formula that gives a good description of the high-frequency range of the computed acoustic spectrum for high rotation rates. Differences between this formula and complete eigenmode calculations are shown to be substantially smaller than those obtained with a 3rd order perturbative method valid at low rotation rates. |
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| 1: | Laboratoire d'Astrophysique de l'Observatoire Midi-Pyrénées (LATT) |
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CNRS : UMR5572 – INSU – Observatoire Midi-Pyrénées – Université Paul Sabatier [UPS] - Toulouse III |
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| 2: | Laboratoire Astrophysique de Toulouse-Tarbes (LATT) |
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CNRS : UMR5572 – INSU – Observatoire Midi-Pyrénées – Université Paul Sabatier [UPS] - Toulouse III |
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| Subject | : | Physics/Astrophysics/Cosmology and Extra-Galactic Astrophysics |
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| stars: oscillations – stars: rotation |
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| Fulltext link: |
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| http://fr.arXiv.org/abs/0801.4630 |
| hal-00288325, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00288325 | |
| oai:hal.archives-ouvertes.fr:hal-00288325 | |
| From: Dominique Lullier | |
| Submitted on: Monday, 16 June 2008 14:27:35 | |
| Updated on: Monday, 16 June 2008 14:27:35 | |
