INVESTIGADORES
CORSICO Alejandro Hugo
artículos
Título:
Toward ensemble asteroseismology of ZZ Ceti stars with fully evolutionary models
Autor/es:
A. D. ROMERO; A. H. CÓRSICO; L. G. ALTHAUS; S. O. KEPLER; B. G. CASTANHEIRA; M. M. MILLER BERTOLAMI
Revista:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Año: 2012 vol. 420 p. 1462 - 1480
ISSN:
0035-8711
Resumen:
ZZ Ceti stars form the most numerous group of degenerate variable stars.
They are otherwise normal DA (H-rich atmospheres) white dwarfs that
exhibit pulsations. Here, we present an asteroseismological analysis for
44 bright ZZ Ceti stars based on a new set of fully evolutionary DA
white dwarf models characterized by detailed chemical profiles from the
centre to the surface. One of our targets is the archetypal ZZ Ceti star
G117-B15A, for which we obtain an asteroseismological model with an
effective temperature and a surface gravity in excellent agreement with
the spectroscopy. The asteroseismological analysis of a set of 44 ZZ
Ceti stars has the potential to characterize the global properties of
the class, in particular the thicknesses of the hydrogen envelope and
the stellar masses. Our results support the belief that white dwarfs in
the solar neighbourhood harbour a broad range of hydrogen-layer
thickness.