IALP   13078
INSTITUTO DE ASTROFISICA LA PLATA
Unidad Ejecutora - UE
artículos
Título:
Probing the internal rotation of pre-white dwarf stars with asteroseismology: the case of PG 0122+200
Autor/es:
CÓRSICO, A. H.; ALTHAUS, L. G.; KAWALER, S.; M. M. MILLER BERTOLAMI; GARCÍA-BERRO, E.; KEPLER, S. O.
Revista:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Lugar: Londres; Año: 2011 vol. 418 p. 2519 - 2526
ISSN:
0035-8711
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.