Theoretical white-dwarf luminosity functions for two phase diagrams of the carbon-oxygen dense plasma

Details Theoretical white-dwarf luminosity functions for two phase diagrams of the carbon-oxygen dense plasma Theoretical white-dwarf luminosity functions for two phase diagrams of the carbon-oxygen dense plasma

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...193..141g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 193, no. 1-2, March 1988, p. 141-147.

Astronomy and Astrophysics

Astrophysics

50

Cosmic Plasma, Dark Matter, Dense Plasmas, Stellar Luminosity, White Dwarf Stars, Carbon, Oxygen, Phase Diagrams

Scientific paper

The white dwarf luminosity function is obtained for two phase diagrams of the carbon-oxygen dense plasma. In the first case, carbon and oxygen are totally mixed in solid phase and results are obtained that are in good agreement with recent calculations of Iben and Tutukov (1984). In the second case, either pure carbon or pure oxygen crystallizes, depending on the composition of the liquid mixture compared to an eutectic having a carbon mass fraction X(c) of roughly 0.6. Due to the larger density of solid oxygen, this leads to the formation of an oxygen core surrounded by a carbon-rich mantle. The redistribution of elements releases a substantial amount of energy which slows down the cooling. The resulting theoretical luminosity function falls abruptly at (log L/L(solar) is roughly 4.6, this value corresponding to a cooling time of 15 yr, assumed to be the age of the Galactic disk. Carbon-oxygen separation can therefore explain the low luminosity cut-off observed in the white dwarf luminosity function which is not predicted by standard cooling theory.

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