117 citations · 413 across the 13 of their papers we have counts for
11 papers · 1 filter
On the origin of white dwarfs with carbon-dominated atmospheres: the case of H1504+65
L. G. Althaus, A. H. Córsico, S. Torres +1
We explore different evolutionary scenarios to explain the helium deficiency observed in H1504+65, the most massive known PG1159 star. We concentrate mainly on the possibility that…
Evidence of thin helium envelopes in PG1159 stars
L. G. Althaus, A. H. Córsico, M. M. Miller Bertolami +2
We present evidence that PG1159 stars could harbour He--rich envelopes substantially thinner than those predicted by current evolutionary models with current estimates of mass loss…
The pulsation modes of the pre-white dwarf PG 1159-035
J. E. S. Costa, S. O. Kepler, D. E. Winget +74
PG 1159-035, a pre-white dwarf with T_eff=140,000 K, is the prototype of both two classes: the PG1159 spectroscopic class and the DOV pulsating class. Previous studies of PG 1159-0…
Asteroseismological measurements on PG 1159-035, the prototype of the GW Vir variable stars
A. H. Córsico, L. G. Althaus, S. O. Kepler +2
An asteroseismological study of PG 1159-035, the prototype of the GW Vir variable stars, has been performed on the basis of detailed and full PG1159 evolutionary models presented b…
On the systematics of asteroseismological mass determinations of PG1159 stars
L. G. Althaus, A. H. Córsico, S. O. Kepler +1
We analyze systematics in the asteroseismological mass determination methods in pulsating PG 1159 stars. We compare the seismic masses resulting from the comparison of the observed…
Asteroseismological constraints on the coolest GW Vir variable star (PG 1159-type)PG 0122+200
A. H. Córsico, M. M. Miller Bertolami, L. G. Althaus +2
We present an asteroseismological study on PG 0122+200, the coolest known pulsating PG1159 (GW Vir) star. Our results are based on an augmented set of the full PG1159 evolutionary…