Artículos de revistas
Probing the internal rotation of pre-white dwarf stars with asteroseismology: the case of PG 0122+200
Fecha
2011-12Registro en:
Corsico, Alejandro Hugo; Althaus, Leandro Gabriel; Kawaler, S. D.; Miller Bertolami, Marcelo Miguel; García Berro, E. ; et al.; Probing the internal rotation of pre-white dwarf stars with asteroseismology: the case of PG 0122+200; Royal Astronomical Society; Monthly Notices Of The Royal Astronomical Society; 418; 4; 12-2011; 2519-2526
0035-8711
Autor
Corsico, Alejandro Hugo
Althaus, Leandro Gabriel
Kawaler, S. D.
Miller Bertolami, Marcelo Miguel
García Berro, E.
Kepler, S. O.
Resumen
We put asteroseismological constraints on the internal rotation profile of the GW Vir (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.