269 citations · 2k across the 53 of their papers we have counts for
11 papers · 1 filter
Asteroseismology of the Kepler V777 Her variable white dwarf with fully evolutionary models
Alejandro H. Córsico, Leandro G. Althaus, Marcelo M. Miller Bertolami +1
DBV stars are pulsating white dwarfs with atmospheres rich in He. Asteroseismology of DBV stars can provide valuable clues about the origin, structure and evolution of hydrogen-def…
A first asteroseismological analysis on WD J1916+3938, the ZZ Ceti star discovered in the Kepler mission field
Alejandro H. Córsico, Alejandra D. Romero, Leandro G. Althaus +1
Asteroseismology of DAV stars (ZZ Ceti variables) can provide valuable clues about the origin, structure and evolution of DA (atmospheres rich in H) white dwarfs. Recently, a new D…
Exploring the effects of detailed chemical profiles on the adiabatic oscillation spectrum of sdB stars: First Results
M. M. Miller Bertolami, A. H. Córsico, L. G. Althaus
We present results of an ongoing study of the pulsational properties of sdB stellar models aimed at exploring the consequences of detailed chemical transitions for radial, and…
NSV 11749, an elder sibling of the born again stars V605 Aql and V4334 Sgr?
M. M. Miller Bertolami, R. D. Rohrmann, A. Granada +1
We argue that NSV 11749, an eruption observed in the early twentieth century, was a rare event known as "very late thermal pulse" (VLTP). To support our argument we compare the lig…
New phase diagrams for dense carbon-oxygen mixtures and white dwarf evolution
Leandro G. Althaus, Enrique García-Berro, Jordi Isern +2
Cool white dwarfs are reliable and independent stellar chronometers. The most common white dwarfs have carbon-oxygen dense cores. Consequently, the cooling ages of very cool white…
On the challenging variability of LS IV-14°116: pulsational instabilities excited by the ε-mechanism
M. M. Miller Bertolami, A. H. Córsico, L. G. Althaus
We investigate the pulsation driving mechanism responsible for the long-period photometric variations observed in LS IV-14°116, a subdwarf B star showing a He-enriched atmospheric…
Toward ensemble asteroseismology of ZZ Ceti stars with fully evolutionary models
Alejandra D. Romero, Alejandro H. Córsico, Leandro G. Althaus +3
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…
Constraining the axion mass through the asteroseismology of the ZZ Ceti star G117-B15A
A. H. Córsico, L. G. Althaus, A. D. Romero +3
We perform an asteroseismological study on the DAV star G117-B15A on the basis of a modern set of fully evolutionary DA white dwarf models that have consistent chemical profiles at…
The internal rotation of the GW Vir star PG 0112+200 through the eyes of asteroseismology
A. H. Córsico, L. G. Althaus, S. D. Kawaler +2
We investigate the internal rotation profile of the GW Vir (PG1159-type) star PG 0122+200 by employing an asteroseismological model that closely reproduces the observed periods of…
Probing the internal rotation of pre-white dwarf stars with asteroseismology: the case of PG 122+200
A. H. Córsico, L. G. Althaus, S. D. Kawaler +3
We put asteroseismological constraints on the internal rotation profile of the GW Vir (PG1159-type) star PG 0122+200. To this end we employ a state-of-the-art asteroseismological m…
Thermohaline mixing and the photospheric composition of low-mass giant stars
F. C. Wachlin, M. M. Miller Bertolami, L. G. Althaus
We compute full evolutionary sequences of red giant branch stars close to the luminosity bump by including state of the art composition transport prescriptions for the thermohaline…