Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-08-15
Mon.Not.Roy.Astron.Soc. 381 (2007) 1702-1710
Astronomy and Astrophysics
Astrophysics
19 pages, 3 figures, accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2007.12342.x
One of the effective mechanisms of neutrino energy losses in red giants, presupernovae and in the cores of white dwarfs is the emission of neutrino-antineutrino pairs in the process of plasmon decay. In this paper, we numerically calculate the emissivity due to plasmon decay in a wide range of temperatures (10^7-10^11) K and densities (200-10^14) g cm^-3. Numerical results are approximated by convenient analytical expressions. We also calculate and approximate by analytical expressions the neutrino luminosity of white dwarfs due to plasmon decay, as a function of their mass and internal temperature. This neutrino luminosity depends on the chemical composition of white dwarfs only through the parameter mu_e (the net number of baryons per electron) and is the dominant neutrino luminosity in all white dwarfs at the neutrino cooling stage.
Gusakov Mikhail E.
Kantor Elena M.
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