Evolution of DB white dwarfs in the Canuto and Mazzitelli theory of convection

We compute the evolution of DB (helium-rich envelope) white dwarf models with masses between 0.4 and 1 Mo and metallicities of Z=O.OOI and 0.004, taking into account Canuto & Mazzitelli's new theory of convection. This theory, which has no free parameters and includes the full spectrum...

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Detalles Bibliográficos
Autores principales: Althaus, Leandro Gabriel, Benvenuto, Omar Gustavo
Formato: Articulo
Lenguaje:Inglés
Publicado: 1996
Materias:
Astronomía
convection
stars: evolution
white dwarfs
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/141312
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-141312
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Astronomía
convection
stars: evolution
white dwarfs
spellingShingle Astronomía
convection
stars: evolution
white dwarfs
Althaus, Leandro Gabriel
Benvenuto, Omar Gustavo
Evolution of DB white dwarfs in the Canuto and Mazzitelli theory of convection
topic_facet Astronomía
convection
stars: evolution
white dwarfs
description We compute the evolution of DB (helium-rich envelope) white dwarf models with masses between 0.4 and 1 Mo and metallicities of Z=O.OOI and 0.004, taking into account Canuto & Mazzitelli's new theory of convection. This theory, which has no free parameters and includes the full spectrum of turbulent eddies, has been successfully tested in different stellar objects and represents a substantial improvement compared with the classical mixing length theory used in most white dwarf studies. Using thermal time-scales we find that, for the range of masses and metallicities assumed in this study, the Canuto & Mazzitelli theory yields theoretical blue edges between 24 200 and 25 600 K, which is in good agreement with observations of pulsating DB white dwarfs. Calculations are performed considering the mixing length theory as well. In this context, our results are consistent with previous computations.
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 DB white dwarfs in the Canuto and Mazzitelli theory of convection
title_short Evolution of DB white dwarfs in the Canuto and Mazzitelli theory of convection
title_full Evolution of DB white dwarfs in the Canuto and Mazzitelli theory of convection
title_fullStr Evolution of DB white dwarfs in the Canuto and Mazzitelli theory of convection
title_full_unstemmed Evolution of DB white dwarfs in the Canuto and Mazzitelli theory of convection
title_sort evolution of db white dwarfs in the canuto and mazzitelli theory of convection
publishDate 1996
url http://sedici.unlp.edu.ar/handle/10915/141312
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