An upper limit to the secular variation of the gravitational constant from white dwarf stars

A variation of the gravitational constant over cosmological ages modifies the main sequence lifetimes and white dwarf cooling ages. Using an state-of-the-art stellar evolutionary code we compute the effects of a secularly varying G on the main sequence ages and, employing white dwarf cooling ages co...

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Autores principales: García Berro, Enrique, Lorén Aguilar, Pablo, Torres, Santiago, Althaus, Leandro Gabriel, Isern, Jordi
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2011
Materias:
Ciencias Astronómicas
Gravity
White dwarfs
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/93935
http://iopscience.iop.org/article/10.1088/1475-7516/2011/05/021/meta
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-93935
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
Gravity
White dwarfs
spellingShingle Ciencias Astronómicas
Gravity
White dwarfs
García Berro, Enrique
Lorén Aguilar, Pablo
Torres, Santiago
Althaus, Leandro Gabriel
Isern, Jordi
An upper limit to the secular variation of the gravitational constant from white dwarf stars
topic_facet Ciencias Astronómicas
Gravity
White dwarfs
description A variation of the gravitational constant over cosmological ages modifies the main sequence lifetimes and white dwarf cooling ages. Using an state-of-the-art stellar evolutionary code we compute the effects of a secularly varying G on the main sequence ages and, employing white dwarf cooling ages computed taking into account the effects of a running G, we place constraints on the rate of variation of Newton's constant. This is done using the white dwarf luminosity function and the distance of the well studied open Galactic cluster NGC 6791. We derive an upper bound Ġ/G ~ −1.8 × 10−12 yr−1. This upper limit for the secular variation of the gravitational constant compares favorably with those obtained using other stellar evolutionary properties, and can be easily improved if deep images of the cluster allow to obtain an improved white dwarf luminosity function.
format Articulo
Preprint
author García Berro, Enrique
Lorén Aguilar, Pablo
Torres, Santiago
Althaus, Leandro Gabriel
Isern, Jordi
author_facet García Berro, Enrique
Lorén Aguilar, Pablo
Torres, Santiago
Althaus, Leandro Gabriel
Isern, Jordi
author_sort García Berro, Enrique
title An upper limit to the secular variation of the gravitational constant from white dwarf stars
title_short An upper limit to the secular variation of the gravitational constant from white dwarf stars
title_full An upper limit to the secular variation of the gravitational constant from white dwarf stars
title_fullStr An upper limit to the secular variation of the gravitational constant from white dwarf stars
title_full_unstemmed An upper limit to the secular variation of the gravitational constant from white dwarf stars
title_sort upper limit to the secular variation of the gravitational constant from white dwarf stars
publishDate 2011
url http://sedici.unlp.edu.ar/handle/10915/93935
http://iopscience.iop.org/article/10.1088/1475-7516/2011/05/021/meta
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