Fingering convection in accreting hydrogen white dwarfs

The accretion of heavy material from debris disk on the surface of hydrogen-rich white dwarfs induces a double diffusivity instability known as the fingering convection. It leads to an efficient extra mixing which brings the accreted material deeper in the star than by considering only mixing in the...

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Detalles Bibliográficos
Autores principales: Wachlin, Felipe Carlos, Vauclair, Sylvie, Vauclair, G., Althaus, Leandro Gabriel
Formato: Articulo
Lenguaje:Español
Publicado: 2019
Materias:
Ciencias Astronómicas
Física
White dwarfs
Standard mixing length theory
Thermohaline convection
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/123832
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-123832
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Español
topic Ciencias Astronómicas
Física
White dwarfs
Standard mixing length theory
Thermohaline convection
spellingShingle Ciencias Astronómicas
Física
White dwarfs
Standard mixing length theory
Thermohaline convection
Wachlin, Felipe Carlos
Vauclair, Sylvie
Vauclair, G.
Althaus, Leandro Gabriel
Fingering convection in accreting hydrogen white dwarfs
topic_facet Ciencias Astronómicas
Física
White dwarfs
Standard mixing length theory
Thermohaline convection
description The accretion of heavy material from debris disk on the surface of hydrogen-rich white dwarfs induces a double diffusivity instability known as the fingering convection. It leads to an efficient extra mixing which brings the accreted material deeper in the star than by considering only mixing in the surface dynamical convection zone, in a time scale much shorter than that of gravitational settling. We performed numerical simulations of a continuous accretion of heavy material having a bulk Earth composition on the two well studied DAZ and ZZ Ceti pulsators GD 133 and G 29-38. We find that the existence of fingering convection implies much larger accretion rates to explain the observed abundances than previous estimates based on the standard mixing length theory and gravitational settling only.
format Articulo
Articulo
author Wachlin, Felipe Carlos
Vauclair, Sylvie
Vauclair, G.
Althaus, Leandro Gabriel
author_facet Wachlin, Felipe Carlos
Vauclair, Sylvie
Vauclair, G.
Althaus, Leandro Gabriel
author_sort Wachlin, Felipe Carlos
title Fingering convection in accreting hydrogen white dwarfs
title_short Fingering convection in accreting hydrogen white dwarfs
title_full Fingering convection in accreting hydrogen white dwarfs
title_fullStr Fingering convection in accreting hydrogen white dwarfs
title_full_unstemmed Fingering convection in accreting hydrogen white dwarfs
title_sort fingering convection in accreting hydrogen white dwarfs
publishDate 2019
url http://sedici.unlp.edu.ar/handle/10915/123832
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AT vauclairsylvie fingeringconvectioninaccretinghydrogenwhitedwarfs
AT vauclairg fingeringconvectioninaccretinghydrogenwhitedwarfs
AT althausleandrogabriel fingeringconvectioninaccretinghydrogenwhitedwarfs
bdutipo_str Repositorios
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