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

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...

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Detalles Bibliográficos
Autores principales: Córsico, Alejandro Hugo, Althaus, Leandro Gabriel, Kawaler, S. D., Miller Bertolami, Marcelo Miguel, García Berro, E., Kepler, S. O.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2011
Materias:
Ciencias Astronómicas
Stars: evolution
Stars: individual: PG 0122+200
Stars: interiors
Stars: oscillations
Stars: rotation
White dwarfs
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84856
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-84856
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Stars: evolution
Stars: individual: PG 0122+200
Stars: interiors
Stars: oscillations
Stars: rotation
White dwarfs
spellingShingle Ciencias Astronómicas
Stars: evolution
Stars: individual: PG 0122+200
Stars: interiors
Stars: oscillations
Stars: rotation
White dwarfs
Córsico, Alejandro Hugo
Althaus, Leandro Gabriel
Kawaler, S. D.
Miller Bertolami, Marcelo Miguel
García Berro, E.
Kepler, S. O.
Probing the internal rotation of pre-white dwarf stars with asteroseismology: the case of PG 0122+200
topic_facet Ciencias Astronómicas
Stars: evolution
Stars: individual: PG 0122+200
Stars: interiors
Stars: oscillations
Stars: rotation
White dwarfs
description 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.
format Articulo
Articulo
author Córsico, Alejandro Hugo
Althaus, Leandro Gabriel
Kawaler, S. D.
Miller Bertolami, Marcelo Miguel
García Berro, E.
Kepler, S. O.
author_facet Córsico, Alejandro Hugo
Althaus, Leandro Gabriel
Kawaler, S. D.
Miller Bertolami, Marcelo Miguel
García Berro, E.
Kepler, S. O.
author_sort Córsico, Alejandro Hugo
title Probing the internal rotation of pre-white dwarf stars with asteroseismology: the case of PG 0122+200
title_short Probing the internal rotation of pre-white dwarf stars with asteroseismology: the case of PG 0122+200
title_full Probing the internal rotation of pre-white dwarf stars with asteroseismology: the case of PG 0122+200
title_fullStr Probing the internal rotation of pre-white dwarf stars with asteroseismology: the case of PG 0122+200
title_full_unstemmed Probing the internal rotation of pre-white dwarf stars with asteroseismology: the case of PG 0122+200
title_sort probing the internal rotation of pre-white dwarf stars with asteroseismology: the case of pg 0122+200
publishDate 2011
url http://sedici.unlp.edu.ar/handle/10915/84856
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