2004A&A...427..923C


Query : 2004A&A...427..923C

2004A&A...427..923C - Astronomy and Astrophysics, volume 427, 923-932 (2004/12-1)

Pulsations of massive ZZ Ceti stars with carbon/oxygen and oxygen/neon cores.

CORSICO A.H., GARCIA-BERRO E., ALTHAUS L.G. and ISERN J.

Abstract (from CDS):

We explore the adiabatic pulsational properties of massive white dwarf stars with hydrogen-rich envelopes and oxygen/neon and carbon/oxygen cores. To this end, we compute the cooling of massive white dwarf models for both core compositions taking into account the evolutionary history of the progenitor stars and the chemical evolution caused by time-dependent element diffusion. In particular, for the oxygen/neon models we adopt the chemical profile resulting from repeated carbon-burning shell flashes expected in very massive white dwarf progenitors. For carbon/oxygen white dwarfs we consider the chemical profiles resulting from phase separation upon crystallization. For both compositions we also take into account the effects of crystallization on the oscillation eigenmodes. We find that the pulsational properties of oxygen/neon white dwarfs are noticeably different from those made of carbon/oxygen, thus making asteroseismological techniques a promising way to distinguish between the two types of stars and, hence, to obtain valuable information about their progenitors.

Abstract Copyright:

Journal keyword(s): stars: evolution - stars: white dwarfs - stars: oscillations

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 V* CL Oct WD* 03 17 15.8468594712 -85 32 25.558244556   13.78 13.66 15.19   DAP 153 1
2 LB 9802 WD* 03 17 19.1282833488 -85 32 31.288377552   13.78 13.66 14.43   DA 125 1
3 WG 22 WD* 12 38 49.7811220835 -49 48 00.219515411   14.14 13.96     DA4.2 214 0
4 PG 1658+441 WD* 16 59 48.4241073768 +44 01 04.038522204   14.3 14.6     DAP1.6 138 0
5 PB 8040 WD* 23 52 31.9204033479 -02 53 11.748295660   17.1 16.99 17.1   DA4.7 31 0

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2022.08.10-07:09:46

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