Modeling He-rich subdwarfs through the hot-flasher scenario

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We present 1D numerical simulations aimed at studying the hot-flasher scenario for the formation of He-rich subdwarf stars. Sequences were calculated for a wide range of metallicities and with the He core flash at different points of the post-RGB evolution (i.e. different remnant masses). We followe...

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Detalles Bibliográficos
Autores principales: Miller Bertolami, Marcelo Miguel, Althaus, Leandro Gabriel, Unglaub, K., Weiss, A.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2009
Materias:
Ciencias Astronómicas
Estrellas Celestiales
Simulación
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/82797
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-82797
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
Simulación
spellingShingle Ciencias Astronómicas
Estrellas Celestiales
Simulación
Miller Bertolami, Marcelo Miguel
Althaus, Leandro Gabriel
Unglaub, K.
Weiss, A.
Modeling He-rich subdwarfs through the hot-flasher scenario
topic_facet Ciencias Astronómicas
Estrellas Celestiales
Simulación
description We present 1D numerical simulations aimed at studying the hot-flasher scenario for the formation of He-rich subdwarf stars. Sequences were calculated for a wide range of metallicities and with the He core flash at different points of the post-RGB evolution (i.e. different remnant masses). We followed the complete evolution from the ZAMS, through the hot-flasher event, and to the subdwarf stage for all kinds of hot-flashers. This allows us to present a homogeneous set of abundances for different metallicities and all flavors of hot-flashers. We extend the scope of our work by analyzing the effects in the predicted surface abundances of some standard assumptions in convective mixing and the effects of element diffusion. We find that the hot-flasher scenario is a viable explanation for the formation of He-sdO stars. Our results also show that element diffusion may produce the transformation of (post hot-flasher) He-rich atmospheres into He-deficient ones. If this is so, then the hot-flasher scenario is able to reproduce both the observed properties and distribution of He-sdO stars.
format Articulo
Articulo
author Miller Bertolami, Marcelo Miguel
Althaus, Leandro Gabriel
Unglaub, K.
Weiss, A.
author_facet Miller Bertolami, Marcelo Miguel
Althaus, Leandro Gabriel
Unglaub, K.
Weiss, A.
author_sort Miller Bertolami, Marcelo Miguel
title Modeling He-rich subdwarfs through the hot-flasher scenario
title_short Modeling He-rich subdwarfs through the hot-flasher scenario
title_full Modeling He-rich subdwarfs through the hot-flasher scenario
title_fullStr Modeling He-rich subdwarfs through the hot-flasher scenario
title_full_unstemmed Modeling He-rich subdwarfs through the hot-flasher scenario
title_sort modeling he-rich subdwarfs through the hot-flasher scenario
publishDate 2009
url http://sedici.unlp.edu.ar/handle/10915/82797
work_keys_str_mv AT millerbertolamimarcelomiguel modelingherichsubdwarfsthroughthehotflasherscenario
AT althausleandrogabriel modelingherichsubdwarfsthroughthehotflasherscenario
AT unglaubk modelingherichsubdwarfsthroughthehotflasherscenario
AT weissa modelingherichsubdwarfsthroughthehotflasherscenario
bdutipo_str Repositorios
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