INVESTIGADORES
MILLER BERTOLAMI Marcelo Miguel
artículos
Título:
The rate of cooling of the pulsating white dwarf star G117-B15A: a new asteroseismological inference of the axion mass
Autor/es:
CORSICO, A.; ALTHAUS, L. G.; M. M. MILLER BERTOLAMI; ROMERO, A. D.; E. GARCIA-BERRO; ISERN, J.; S. O. KEPLER
Revista:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Lugar: Londres; Año: 2012 vol. 424 p. 2792 - 2799
ISSN:
0035-8711
Resumen:
We employ a state-of-the-art asteroseismological model of G117−B15A, the
archetype of the H-rich atmosphere (DA) white dwarf
pulsators (also known as DAV or ZZ Ceti variables),
and use the most recently measured value of the rate of period change
for the dominant mode of this pulsating star to
derive a new constraint on the mass of axion, the still conjectural
non-baryonic
particle considered as a candidate for dark matter
of the Universe. Assuming that G117−B15A is truly represented by our
asteroseismological
model, and, in particular, that the period of the
dominant mode is associated with a pulsation g mode trapped in the H envelope, we find strong indications of the existence of extra cooling in this star, compatible with
emission of axions of mass meV.