On the robustness of H-deficient post-AGB tracks

Aims. We analyze the robustness of H-deficient post-AGB tracks regarding previous evolution of their progenitor stars and the constitutive physics of the remnants. Our motivation is a recent suggestion of Werner & Herwig (2006, PASP, 118, 183) that previous evolution should be important in shapi...

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Detalles Bibliográficos
Autores principales: Miller Bertolami, Marcelo Miguel, Althaus, Leandro Gabriel
Formato: Articulo
Lenguaje:Inglés
Publicado: 2007
Materias:
Ciencias Astronómicas
Stars: AGB and post-AGB
While dwarfs
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/83539
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-83539
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Stars: AGB and post-AGB
While dwarfs
spellingShingle Ciencias Astronómicas
Stars: AGB and post-AGB
While dwarfs
Miller Bertolami, Marcelo Miguel
Althaus, Leandro Gabriel
On the robustness of H-deficient post-AGB tracks
topic_facet Ciencias Astronómicas
Stars: AGB and post-AGB
While dwarfs
description Aims. We analyze the robustness of H-deficient post-AGB tracks regarding previous evolution of their progenitor stars and the constitutive physics of the remnants. Our motivation is a recent suggestion of Werner & Herwig (2006, PASP, 118, 183) that previous evolution should be important in shaping the final post-AGB track and the persisting discrepancy between asteroseismological and spectroscopical mass determinations. This work is thus complementary to our previous work (Miller Bertolami & Althaus 2006, A&A, 454, 845) and intends to shed some light on the uncertainty behind the evolutionary tracks presented there. Methods. We compute full evolutionary models for PG 1159 stars taking into account different extramixing (overshooting) efficiencies and lifetimes on the TP-AGB during the progenitor evolution. We also assess the effect of possible differences in the opacities and equation of state by artificially changing them before the PG 1159 stage. Also comparisons are made with the few H-deficient post-AGB tracks available in the literature. Results. Contrary to our expectations, we found that previous evolution is not a main factor in shaping H-deficient post-AGB tracks. Interestingly enough, we find that only an increase of ∼50% in the intershell opacities at high effective temperatures may affect the tracks as to reconcile spectroscopic and asteroseismologic mass determinations. This forces us to conclude that our previous tracks (Miller Bertolami & Althaus 2006) are robust enough as to be used for spectroscopic mass determinations, unless opacities in the intershell region are substantially different. Our results, then, call for an analysis of possible systematics in the usually adopted asteroseismological mass determination methods.
format Articulo
Articulo
author Miller Bertolami, Marcelo Miguel
Althaus, Leandro Gabriel
author_facet Miller Bertolami, Marcelo Miguel
Althaus, Leandro Gabriel
author_sort Miller Bertolami, Marcelo Miguel
title On the robustness of H-deficient post-AGB tracks
title_short On the robustness of H-deficient post-AGB tracks
title_full On the robustness of H-deficient post-AGB tracks
title_fullStr On the robustness of H-deficient post-AGB tracks
title_full_unstemmed On the robustness of H-deficient post-AGB tracks
title_sort on the robustness of h-deficient post-agb tracks
publishDate 2007
url http://sedici.unlp.edu.ar/handle/10915/83539
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bdutipo_str Repositorios
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