A white dwarf cooling age of 8 Gyr for NGC 6791 from physical separation processes

NGC 6791 is a well studied open cluster1 that it is so close to us that can be imaged down to very faint luminosities. The mainsequence turn-off age (∼8 Gyr) and the age derived from the termination of the white dwarf cooling sequence (∼6 Gyr) are very different. One possible explanation is that as...

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Autores principales: García Berro, Enrique, Torres, Santiago, Althaus, Leandro Gabriel, Renedo, I., Lorén Aguilar, Pablo, Córsico, Alejandro Hugo, Rohrmann, René D., Salaris, Maurizio, Isern, Jordi
Formato: Articulo
Lenguaje:Inglés
Publicado: 2010
Materias:
Ciencias Astronómicas
NGC 6791
Estrellas
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/123929
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-123929
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
NGC 6791
Estrellas
spellingShingle Ciencias Astronómicas
NGC 6791
Estrellas
García Berro, Enrique
Torres, Santiago
Althaus, Leandro Gabriel
Renedo, I.
Lorén Aguilar, Pablo
Córsico, Alejandro Hugo
Rohrmann, René D.
Salaris, Maurizio
Isern, Jordi
A white dwarf cooling age of 8 Gyr for NGC 6791 from physical separation processes
topic_facet Ciencias Astronómicas
NGC 6791
Estrellas
description NGC 6791 is a well studied open cluster1 that it is so close to us that can be imaged down to very faint luminosities. The mainsequence turn-off age (∼8 Gyr) and the age derived from the termination of the white dwarf cooling sequence (∼6 Gyr) are very different. One possible explanation is that as white dwarfs cool, one of the ashes of helium burning, 22Ne, sinks in the deep interior of these stars. At lower temperatures, white dwarfs are expected to crystallize and phase separation of the main constituents of the core of a typical white dwarf (12C and 16O) is expected to occur. This sequence of events is expected to introduce long delays in the cooling times, but has not hitherto been proven. Here we report that, as theoretically anticipated, physical separation processes occur in the cores of white dwarfs, resolving the age discrepancy for NGC 6791.
format Articulo
Articulo
author García Berro, Enrique
Torres, Santiago
Althaus, Leandro Gabriel
Renedo, I.
Lorén Aguilar, Pablo
Córsico, Alejandro Hugo
Rohrmann, René D.
Salaris, Maurizio
Isern, Jordi
author_facet García Berro, Enrique
Torres, Santiago
Althaus, Leandro Gabriel
Renedo, I.
Lorén Aguilar, Pablo
Córsico, Alejandro Hugo
Rohrmann, René D.
Salaris, Maurizio
Isern, Jordi
author_sort García Berro, Enrique
title A white dwarf cooling age of 8 Gyr for NGC 6791 from physical separation processes
title_short A white dwarf cooling age of 8 Gyr for NGC 6791 from physical separation processes
title_full A white dwarf cooling age of 8 Gyr for NGC 6791 from physical separation processes
title_fullStr A white dwarf cooling age of 8 Gyr for NGC 6791 from physical separation processes
title_full_unstemmed A white dwarf cooling age of 8 Gyr for NGC 6791 from physical separation processes
title_sort white dwarf cooling age of 8 gyr for ngc 6791 from physical separation processes
publishDate 2010
url http://sedici.unlp.edu.ar/handle/10915/123929
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