IALP 13078
INSTITUTO DE ASTROFISICA LA PLATA
Unidad Ejecutora - UE
artículos
Título:
Asteroseismological Study of Massive ZZ Ceti Stars with Fully Evolutionary Models
Autor/es:
ROMERO, A. D.; KEPLER, S. O.; CÓRSICO, A. H.; ALTHAUS, L. G.; FRAGA, L.
Revista:
ASTROPHYSICAL JOURNAL
Editorial:
IOP PUBLISHING LTD
Referencias:
Lugar: Londres; Año: 2013 vol. 779 p. 58 - 82
ISSN:
0004-637X
Resumen:
We present the first asteroseismological study for 42 massive ZZ Ceti
stars based on a large set of fully evolutionary carbon-oxygen core DA
white dwarf models characterized by a detailed and consistent chemical
inner profile for the core and the envelope. Our sample comprises all of
the ZZ Ceti stars with spectroscopic stellar masses between 0.72 and
1.05 M ⊙ known to date. The asteroseismological
analysis of a set of 42 stars enables study of the ensemble properties
of the massive, pulsating white dwarf stars with carbon-oxygen cores, in
particular the thickness of the hydrogen envelope and the stellar mass.
A significant fraction of stars in our sample have stellar mass that is
high enough to crystallize at the effective temperatures of the ZZ Ceti
instability strip, which enables us to study the effects of
crystallization on the pulsation properties of these stars. Our results
show that the phase diagram presented in Horowitz et al. seems to be a
good representation of the crystallization process inside white dwarf
stars, in agreement with the results from white dwarf luminosity
function in globular clusters.
