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Titolo: Prospects for measuring differential rotation in white dwarfs through asteroseismology
Autore: Kawaler, SD; Sekii, T; Gough, D;
- Indirizzi:
- Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA Iowa State Univ Ames IA USA 50011 Dept Phys & Astron, Ames, IA 50011 USA Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England Univ Cambridge Cambridge England CB3 0HA ron, Cambridge CB3 0HA, England Univ Cambridge, Dept Appl Math & Theoret Phys, Cambridge CB3 9EW, England Univ Cambridge Cambridge England CB3 9EW hys, Cambridge CB3 9EW, England
- Titolo Testata:
- ASTROPHYSICAL JOURNAL
fascicolo: 1,
volume: 516,
anno: 1999,
parte:, 1
pagine: 349 - 365
- SICI:
- 0004-637X(19990501)516:1<349:PFMDRI>2.0.ZU;2-7
- Fonte:
- ISI
- Lingua:
- ENG
- Soggetto:
- WHOLE EARTH TELESCOPE; INVERTING HELIOSEISMIC DATA; PG-1159 STARS; GD-358;
- Keywords:
- stars : individual (PG 1159-035, GD 358); stars : oscillations; stars : rotation; white dwarfs;
- Tipo documento:
- Article
- Natura:
- Periodico
- Settore Disciplinare:
- Physical, Chemical & Earth Sciences
- Citazioni:
- 22
- Recensione:
- Indirizzi per estratti:
- Indirizzo: Kawaler, SD Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA Iowa State Univ Ames IA USA 50011 Astron, Ames, IA 50011 USA
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- Citazione:
- S.D. Kawaler et al., "Prospects for measuring differential rotation in white dwarfs through asteroseismology", ASTROPHYS J, 516(1), 1999, pp. 349-365
Abstract
We examine the potential of asteroseismology for exploring the internal rotation of white dwarf stars. Data from global observing campaigns have revealed a wealth of frequencies, some of which show the signature of rotational splitting. Tools developed for helioseisanology to use many solar p-mode frequencies for inversion of the rotation rate with depth are adapted to the case of more limited numbers of modes of low degree. We find that the small number of available modes in white dwarfs, coupled with the similarity between the rotational-splitting kernels of the modes, renders direct inversion unstable. Accordingly, we adopt what we consider to be plausible functional forms for the differential rotation profile; this is sufficiently restrictive to enable us to carry out a useful calibration. We show examples ofthis technique for PG 1159 stars and pulsating DB white dwarfs. Published frequency splittings for white dwarfs are currently not accurate enough formeaningful inversions; reanalysis of existing data can provide splittings of sufficient accuracy when the frequencies of individual peaks are extracted via least-squares fitting or multipeak decompositions. We find that, when mode trapping is evident in the period spacing of g modes, the measured splittings can constrain d Omega/dr.
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Documento generato il 22/05/13 alle ore 23:38:28