The formation of a helium white dwarf in a close binary system with diffusion

We study the evolution of a system composed of a 1.4-M⊙ neutron star and a normal, solar composition star of 2 M⊙ in orbit with a period of 1 d. Calculations were performed employing the binary HYDRO code presented by Benvenuto & De Vito that handle the mass transfer rate in a fully implicit way...

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Detalles Bibliográficos
Autores principales: Benvenuto, Omar Gustavo, De Vito, María Alejandra
Formato: Articulo
Lenguaje:Inglés
Publicado: 2004
Materias:
Ciencias Astronómicas
Binaries: general
Stars: evolution
Stars: interiors
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/83287
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-83287
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
Binaries: general
Stars: evolution
Stars: interiors
spellingShingle Ciencias Astronómicas
Binaries: general
Stars: evolution
Stars: interiors
Benvenuto, Omar Gustavo
De Vito, María Alejandra
The formation of a helium white dwarf in a close binary system with diffusion
topic_facet Ciencias Astronómicas
Binaries: general
Stars: evolution
Stars: interiors
description We study the evolution of a system composed of a 1.4-M⊙ neutron star and a normal, solar composition star of 2 M⊙ in orbit with a period of 1 d. Calculations were performed employing the binary HYDRO code presented by Benvenuto & De Vito that handle the mass transfer rate in a fully implicit way. We then included the main standard physical ingredients together with the diffusion processes and a proper outer boundary condition. We have assumed fully non-conservative mass transfer episodes. In order to study the interplay of mass loss episodes and diffusion we considered evolutionary sequences with and without diffusion in which all Roche lobe overflows (RLOFs) produce mass transfer. Another two sequences in which thermonuclearly driven RLOFs were not allowed to drive mass transfer have been computed with and without diffusion. As far as we are aware, this study represents the first binary evolution calculations in which diffusion is considered. The system produces a helium white dwarf of ∼0.21 M⊙ in an orbit with a period of ∼4.3 d for the four cases. We find that mass transfer episodes induced by hydrogen thermonuclear flashes drive a tiny amount of mass transfer. As diffusion produces stronger flashes, the amount of hydrogen-rich matter transferred is slightly higher than in the models without diffusion. We find that diffusion is the main agent in determining the evolutionary time-scale of low-mass white dwarfs even in the presence of mass transfer episodes.
format Articulo
Articulo
author Benvenuto, Omar Gustavo
De Vito, María Alejandra
author_facet Benvenuto, Omar Gustavo
De Vito, María Alejandra
author_sort Benvenuto, Omar Gustavo
title The formation of a helium white dwarf in a close binary system with diffusion
title_short The formation of a helium white dwarf in a close binary system with diffusion
title_full The formation of a helium white dwarf in a close binary system with diffusion
title_fullStr The formation of a helium white dwarf in a close binary system with diffusion
title_full_unstemmed The formation of a helium white dwarf in a close binary system with diffusion
title_sort formation of a helium white dwarf in a close binary system with diffusion
publishDate 2004
url http://sedici.unlp.edu.ar/handle/10915/83287
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