Pulsational instabilities in hot pre-horizontal branch stars

The ϵ mechanism is a self-excitation mechanism of pulsations which acts on the regions where nuclear burning takes place. It has been shown that the ϵ mechanism can excite pulsations in models of hot helium-core flash, and that the pulsations of LS IV-14° 116, a He-enriched hot subdwarf star, could...

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Autores principales: Battich, Tiara, Miller Bertolami, Marcelo Miguel, Córsico, Alejandro Hugo, Althaus, Leandro Gabriel
Formato: Articulo
Lenguaje:Inglés
Publicado: 2017
Materias:
Ciencias Astronómicas
Estrellas Celestiales
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/87518
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-87518
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
Estrellas Celestiales
spellingShingle Ciencias Astronómicas
Estrellas Celestiales
Battich, Tiara
Miller Bertolami, Marcelo Miguel
Córsico, Alejandro Hugo
Althaus, Leandro Gabriel
Pulsational instabilities in hot pre-horizontal branch stars
topic_facet Ciencias Astronómicas
Estrellas Celestiales
description The ϵ mechanism is a self-excitation mechanism of pulsations which acts on the regions where nuclear burning takes place. It has been shown that the ϵ mechanism can excite pulsations in models of hot helium-core flash, and that the pulsations of LS IV-14° 116, a He-enriched hot subdwarf star, could be explained that way. We aim to study the ϵ mechanism effects on models of hot pre-horizontal branch stars and determine, if possible, a domain of instability in the log g - log Teff plane. We compute non-adiabatic non-radial pulsations on such stellar models, adopting different values of initial chemical abundances and mass of the hydrogen envelope at the time of the main helium flash. We find an instability domain of long-period (400 s ≤ P ≤ 2500 s) g-modes for models with 22000K ≤ Teff ≤ 50000K and 4.67 ≤ log g ≤ 6.15.
format Articulo
Articulo
author Battich, Tiara
Miller Bertolami, Marcelo Miguel
Córsico, Alejandro Hugo
Althaus, Leandro Gabriel
author_facet Battich, Tiara
Miller Bertolami, Marcelo Miguel
Córsico, Alejandro Hugo
Althaus, Leandro Gabriel
author_sort Battich, Tiara
title Pulsational instabilities in hot pre-horizontal branch stars
title_short Pulsational instabilities in hot pre-horizontal branch stars
title_full Pulsational instabilities in hot pre-horizontal branch stars
title_fullStr Pulsational instabilities in hot pre-horizontal branch stars
title_full_unstemmed Pulsational instabilities in hot pre-horizontal branch stars
title_sort pulsational instabilities in hot pre-horizontal branch stars
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/87518
work_keys_str_mv AT battichtiara pulsationalinstabilitiesinhotprehorizontalbranchstars
AT millerbertolamimarcelomiguel pulsationalinstabilitiesinhotprehorizontalbranchstars
AT corsicoalejandrohugo pulsationalinstabilitiesinhotprehorizontalbranchstars
AT althausleandrogabriel pulsationalinstabilitiesinhotprehorizontalbranchstars
bdutipo_str Repositorios
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