Evolution of DA white dwarfs in the context of a new theory of convection

In this study we compute the structure and evolution of carbon-oxygen DA white dwarfs by means of a detailed and updated evolutionary code. We treat the energy transport by convection within the formalism of the full spectrum turbulence theory, as given by the Canuto, Goldman and Mazzitelli (CGM) mo...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Althaus, Leandro Gabriel, Benvenuto, Omar Gustavo
Formato: Articulo
Lenguaje:Inglés
Publicado: 1998
Materias:
Ciencias Astronómicas
Convection
Stars
Evolution
Surface gravity
White dwarf
Variable
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/123025
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-123025
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
Convection
Stars
Evolution
Surface gravity
White dwarf
Variable
spellingShingle Ciencias Astronómicas
Convection
Stars
Evolution
Surface gravity
White dwarf
Variable
Althaus, Leandro Gabriel
Benvenuto, Omar Gustavo
Evolution of DA white dwarfs in the context of a new theory of convection
topic_facet Ciencias Astronómicas
Convection
Stars
Evolution
Surface gravity
White dwarf
Variable
description In this study we compute the structure and evolution of carbon-oxygen DA white dwarfs by means of a detailed and updated evolutionary code. We treat the energy transport by convection within the formalism of the full spectrum turbulence theory, as given by the Canuto, Goldman and Mazzitelli (CGM) model. We explore the effect of various hydrogen layer masses on both the surface gravity and the hydrogen burning. Convective mixing at low luminosities is also considered. One of our main interests in this work has been to study the evolution of ZZ Ceti models, with the aim of comparing the CGM and mixing length theory (MLT) predictions. In this connection, we find that the temperature profile given by the CGM model is markedly different from that of the ML1 and ML2 versions of MLT. We have also computed approximate effective temperatures for the theoretical blue edge of the DA instability strip by using thermal timescale arguments for our evolving models. In this context, we found that the CGM theory leads to blue edges that are cooler than the observed ones. However, because the determination of the atmospheric parameters of ZZ Ceti stars is dependent on the assumed convection description in model atmosphere calculation, observed blue edges computed considering the CGM theory are required in order to perform a sef consistent comparison of our results with observations. Finally, detailed pulsation calculations of ZZ Ceti models considering the CGM convection would be necessary to place the results found in this paper on a firmer basis.
format Articulo
Articulo
author Althaus, Leandro Gabriel
Benvenuto, Omar Gustavo
author_facet Althaus, Leandro Gabriel
Benvenuto, Omar Gustavo
author_sort Althaus, Leandro Gabriel
title Evolution of DA white dwarfs in the context of a new theory of convection
title_short Evolution of DA white dwarfs in the context of a new theory of convection
title_full Evolution of DA white dwarfs in the context of a new theory of convection
title_fullStr Evolution of DA white dwarfs in the context of a new theory of convection
title_full_unstemmed Evolution of DA white dwarfs in the context of a new theory of convection
title_sort evolution of da white dwarfs in the context of a new theory of convection
publishDate 1998
url http://sedici.unlp.edu.ar/handle/10915/123025
work_keys_str_mv AT althausleandrogabriel evolutionofdawhitedwarfsinthecontextofanewtheoryofconvection
AT benvenutoomargustavo evolutionofdawhitedwarfsinthecontextofanewtheoryofconvection
bdutipo_str Repositorios
_version_ 1764820449624064000

Ejemplares similares