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White Dwarf Crystallization

Published online by Cambridge University Press:  12 April 2016

Enrique Garcia-Berro  and
Margarida Hernanz
Enrique Garcia-Berro
Affiliation:
Departamento de Física Aplicada. , Universidad Politécnica de Cataluña, Jordi Girona Salgado 31, 08034 Barcelona, Spain
Margarida Hernanz
Affiliation:
Centre d’Estudis Avançats de Blanes, C.S.I.C., Camí de Santa Bárbara, 17300 Blanes, Spain

Abstract

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The inclusion of a detailed treatment of solidification processes in the cooling theory of carbon–oxygen white dwarfs is of crucial importance for the determination of their luminosity function. Carbon–oxygen separation at crystallization yields delays larger than 2 Gyr to cool down to luminosities corresponding to the observed cut–off. This leads to estimates of the age of the galactic disk 1.5 to 2 Gyr older than the ones obtained in previous studies (about 9 Gyr). Furthermore, the presence of minor chemical species, in particular 22Ne, alters significantly the crystallization process, and produces extra delays of 2 to 3 gigayears. However, the detailed computation of the theoretical white dwarf luminosity function, taking into account a reasonable model of galactic chemical evolution, and including the effect of these species, shows that the location of the cut–off, and then the estimated age of the disk, is not modified significantly.

Type
Reviews
Information
International Astronomical Union Colloquium , Volume 147: The Equation of State in Astrophysics , 1994 , pp. 161 - 185
Copyright
Copyright © Cambridge University Press 1994

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