Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.277..801g&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 277, Issue 3, pp. 801-810.
Astronomy and Astrophysics
Astronomy
29
Gravitation, Stars: Evolution, White Dwarfs
Scientific paper
In this paper we examine the effects introduced in the luminosity function of white dwarf stars by a change of the gravitational constant during the life of the Universe. A decrease of G induces the expansion of the star and accelerates the cooling process. This effect has noticeable effects on the luminosity function and can be used to set upper bounds on the rate of change of G. The values of the derived upper limit depend on the adopted age of the galactic disc, the position of the cut-off of the white dwarf luminosity function, and the physics of cooling - such as the degree of previous stratification of the chemical constituents of white dwarfs and the phase diagram of the carbon/oxygen (C/O) mixture. For reasonable ages of the solar neighbourhood this method provides G_solar/
Garcia-Berro Enrique
Hernanz Margarida
Isern Jordi
Mochkovitch Robert
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