Pulsations driven by the ε-mechanism in post-merger remnants: First results

Helium-rich subdwarfs are a rare subclass of hot subdwarf stars which constitute a small and inhomogeneous group showing varying degrees of helium enrichment. Only one star, LS IV º14 116 has been found to show multiperiodic luminosity variations. The variability of LS IV º14 116 has been explained...

Descripción completa

Detalles Bibliográficos
Autores principales: Miller Bertolami, Marcelo Miguel, Córsico, Alejandro Hugo, Zhang, X., Althaus, Leandro Gabriel, Jeffery, C.S.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2013
Materias:
Ciencias Astronómicas
Stars
Hot subdwarfs
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/85574
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-85574
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
Hot subdwarfs
spellingShingle Ciencias Astronómicas
Stars
Hot subdwarfs
Miller Bertolami, Marcelo Miguel
Córsico, Alejandro Hugo
Zhang, X.
Althaus, Leandro Gabriel
Jeffery, C.S.
Pulsations driven by the ε-mechanism in post-merger remnants: First results
topic_facet Ciencias Astronómicas
Stars
Hot subdwarfs
description Helium-rich subdwarfs are a rare subclass of hot subdwarf stars which constitute a small and inhomogeneous group showing varying degrees of helium enrichment. Only one star, LS IV º14 116 has been found to show multiperiodic luminosity variations. The variability of LS IV º14 116 has been explained as the consequence of nonradial g-mode oscillations, whose excitation is difficult to understand within the frame of the standard κ-mechanism driving pulsations in sdBV stars. In a recent study, we have proposed that the pulsations of LS IV º14 116 might be driven through the ε-mechanism acting in unstable He-burning zones in the interior of the star, that appear before the quiescent He-burning phase. One of the few accepted scenarios for the formation of He-rich subdwarfs is the merger of two He-core white dwarfs. As part of this project, we present a study of the ε-mechanism in post-merger remnants, and discuss the results in the light of the pulsations exhibited by LS IV º14 116.
format Articulo
Articulo
author Miller Bertolami, Marcelo Miguel
Córsico, Alejandro Hugo
Zhang, X.
Althaus, Leandro Gabriel
Jeffery, C.S.
author_facet Miller Bertolami, Marcelo Miguel
Córsico, Alejandro Hugo
Zhang, X.
Althaus, Leandro Gabriel
Jeffery, C.S.
author_sort Miller Bertolami, Marcelo Miguel
title Pulsations driven by the ε-mechanism in post-merger remnants: First results
title_short Pulsations driven by the ε-mechanism in post-merger remnants: First results
title_full Pulsations driven by the ε-mechanism in post-merger remnants: First results
title_fullStr Pulsations driven by the ε-mechanism in post-merger remnants: First results
title_full_unstemmed Pulsations driven by the ε-mechanism in post-merger remnants: First results
title_sort pulsations driven by the ε-mechanism in post-merger remnants: first results
publishDate 2013
url http://sedici.unlp.edu.ar/handle/10915/85574
work_keys_str_mv AT millerbertolamimarcelomiguel pulsationsdrivenbytheemechanisminpostmergerremnantsfirstresults
AT corsicoalejandrohugo pulsationsdrivenbytheemechanisminpostmergerremnantsfirstresults
AT zhangx pulsationsdrivenbytheemechanisminpostmergerremnantsfirstresults
AT althausleandrogabriel pulsationsdrivenbytheemechanisminpostmergerremnantsfirstresults
AT jefferycs pulsationsdrivenbytheemechanisminpostmergerremnantsfirstresults
bdutipo_str Repositorios
_version_ 1764820489533915141

Ejemplares similares