Asteroseismology of the GW Virginis stars SDSS J0349-0059 and VV 47

Context. GW Virginis stars are a well-studied class of nonradial g-mode pulsators. SDSS J0349-0059 and VV 47 are two PG 1159 star members of this class of variable stars. SDSS J0349-0059 is an interesting GW Vir star that shows a complete pulsation spectrum that includes rotational splitting of some...

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Detalles Bibliográficos
Autores principales: Calcaferro, Leila Magdalena, Córsico, Alejandro Hugo, Althaus, Leandro Gabriel
Formato: Articulo
Lenguaje:Inglés
Publicado: 2016
Materias:
Ciencias Astronómicas
Stars: evolution
Stars: interiors
Stars: oscillations
White dwarfs
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/86208
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-86208
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: interiors
Stars: oscillations
White dwarfs
spellingShingle Ciencias Astronómicas
Stars: evolution
Stars: interiors
Stars: oscillations
White dwarfs
Calcaferro, Leila Magdalena
Córsico, Alejandro Hugo
Althaus, Leandro Gabriel
Asteroseismology of the GW Virginis stars SDSS J0349-0059 and VV 47
topic_facet Ciencias Astronómicas
Stars: evolution
Stars: interiors
Stars: oscillations
White dwarfs
description Context. GW Virginis stars are a well-studied class of nonradial g-mode pulsators. SDSS J0349-0059 and VV 47 are two PG 1159 star members of this class of variable stars. SDSS J0349-0059 is an interesting GW Vir star that shows a complete pulsation spectrum that includes rotational splitting of some of its frequencies. VV 47 is a pulsating PG 1159 star surrounded by a planetary nebula. This star is particularly interesting because it exhibits a rich and complex pulsation spectrum. Aims. We present an asteroseismological study of SDSS J0349-0059 and VV 47 aimed mainly at deriving their total mass on the basis of state-of-the-art PG 1159 evolutionary models. Methods. We computed adiabatic nonradial g-mode pulsation periods for PG 1159 evolutionary models with stellar masses ranging from 0:515 to 0:741 M, that take into account the complete evolution of the progenitor stars. We first estimated a mean period spacing for both SDSS J0349-0059 and VV 47 and then constrained the stellar mass of these stars by comparing the observed period spacing with the asymptotic period spacing and with the average of the computed period spacings. We also employed the individual observed periods to search for a representative seismological model for each star. Finally, we estimated the rotation period of SDSS J0349-0059. Results. We found a spectroscopic mass of M 0:543 M- for SDSS J0349-0059 and M 0:529 M for VV 47. By comparing the observed period spacing with the asymptotic period spacing, we obtain M 0:569 M for SDSS J0349-0059 and M 0:523 M for VV 47. When we compare the observed period spacing with the average of the computed period spacings, we find M0:535 M for SDSS J0349-0059 and M 0:528 M for VV 47. Searching for the best period fit, we found for SDSS J0349-0059 an asteroseismological model with M = 0:542 M and Tt = 91 255 K. For VV 47, we were unable to find a unique and unambiguous asteroseismological model. Finally, for SDSS J0349-0059, we determined the rotation period to be Prot = 1= 0:407 days. Conclusions. The results presented in this work constitute a further step in the study of GW Vir stars through asteroseismology in the frame of fully evolutionary models of PG 1159 stars. In particular, the potential of asteroseismology to derive stellar masses of PG 1159 stars with an unprecedented precision is shown yet again.
format Articulo
Articulo
author Calcaferro, Leila Magdalena
Córsico, Alejandro Hugo
Althaus, Leandro Gabriel
author_facet Calcaferro, Leila Magdalena
Córsico, Alejandro Hugo
Althaus, Leandro Gabriel
author_sort Calcaferro, Leila Magdalena
title Asteroseismology of the GW Virginis stars SDSS J0349-0059 and VV 47
title_short Asteroseismology of the GW Virginis stars SDSS J0349-0059 and VV 47
title_full Asteroseismology of the GW Virginis stars SDSS J0349-0059 and VV 47
title_fullStr Asteroseismology of the GW Virginis stars SDSS J0349-0059 and VV 47
title_full_unstemmed Asteroseismology of the GW Virginis stars SDSS J0349-0059 and VV 47
title_sort asteroseismology of the gw virginis stars sdss j0349-0059 and vv 47
publishDate 2016
url http://sedici.unlp.edu.ar/handle/10915/86208
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AT corsicoalejandrohugo asteroseismologyofthegwvirginisstarssdssj03490059andvv47
AT althausleandrogabriel asteroseismologyofthegwvirginisstarssdssj03490059andvv47
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