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Probing the internal rotation of pre-white dwarf stars with asteroseismology : the case of PG 0122+200

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Probing the internal rotation of pre-white dwarf stars with asteroseismology : the case of PG 0122+200

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Título Probing the internal rotation of pre-white dwarf stars with asteroseismology : the case of PG 0122+200
Autor Córsico, Alejandro Hugo
Althaus, Leandro Gabriel
Kawaler, Steven D.
Bertolami, Marcelo Miguel Miller
García-Berro, Enrique
Kepler, Souza Oliveira
Abstract We put asteroseismological constraints on the internal rotation profile of theGWVir (PG1159- type) star PG 0122+200. To this end we employ a state-of-the-art asteroseismological model for this star and assess the expected frequency splittings induced by rotation adopting a forward approach in which we compare the theoretical frequency separations with the observed ones assuming different types of plausible internal rotation profiles. We also employ two asteroseismological inversion methods for the inversion of the rotation profile of PG 0122+200.We find evidence for differential rotation in this star.We demonstrate that the frequency splittings of the rotational multiplets exhibited by PG 0122+200 are compatible with a rotation profile in which the central regions are spinning about 2.4 times faster than the stellar surface.
Contido em Monthly notices of the royal astronomical society. Oxford. Vol. 418, no. 4 (Dec. 2011), p. 2519-2526
Assunto Anãs brancas
Evolucao estelar
Interior estelar
Rotacao estelar
[en] Stars: evolution
[en] Stars: individual: PG 0122+200
[en] Stars: interiors
[en] Stars: oscillations
[en] Stars: rotation
[en] White dwarfs
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/93364
Arquivos Descrição Formato
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