Axions and the cooling of white dwarf stars

被引:130
作者
Isern, J. [1 ,2 ]
Garcia-Berro, E. [2 ,3 ]
Torres, S. [2 ,3 ]
Catalan, S. [1 ,2 ]
机构
[1] Fac Ciencias, CSIC, Inst Ciencies Espai, Bellaterra 08193, Spain
[2] Inst Estudis Espacials Catalunya, Barcelona 08034, Spain
[3] Univ Politecn Cataluna, Escola Politecn Super Castelldefels, Dept Fis Aplicada, Castelldefels, Spain
关键词
elementary particles; stars : luminosity function; mass function; white dwarfs;
D O I
10.1086/591042
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
White dwarfs are the end product of the lives of intermediate- and low-mass stars and their evolution is described as a simple cooling process. Recently, it has been possible to determine with an unprecedented precision their luminosity function, that is, the number of stars per unit volume and luminosity interval. We show here that the shape of the bright branch of this function is only sensitive to the averaged cooling rate of white dwarfs and we propose to use this property to check the possible existence of axions, a proposed but not yet detected weakly interacting particle. Our results indicate that the inclusion of the emission of axions in the evolutionary models of white dwarfs noticeably improves the agreement between the theoretical calculations and the observational white dwarf luminosity function. The best fit is obtained for m(a) cos(2) beta approximate to 5 meV, where m(a) is the mass of the axion and is a free parameter. We also show that values larger than 10 meV are clearly excluded. 2 cos b The existing theoretical and observational uncertainties do not yet allow the confirmation of the existence of axions, but our results clearly show that if their mass is of the order of a few meV, the white dwarf luminosity function is sensitive enough to detect their existence.
引用
收藏
页码:L109 / L112
页数:4
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