The role of the minor chemical species in the cooling of white dwarfs

Details The role of the minor chemical species in the cooling of white dwarfs The role of the minor chemical species in the cooling of white dwarfs

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...241l..29i&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 241, no. 1, Jan. 1991, p. L29-L32. Research supported by DGICYT.

Astronomy and Astrophysics

Astrophysics

29

Cool Stars, Stellar Composition, Stellar Interiors, Stellar Temperature, White Dwarf Stars, Carbon, Neon, Oxygen, Stellar Luminosity, Phase Diagram, White Dwarfs, Luminosity Function

Scientific paper

White dwarf interiors are made of a mixture of carbon, oxygen and other minor species, 22Ne being the most abundant one. In this Letter we compute a preliminary phase diagram for the C-Ne and O-Ne mixtures and we show that 22Ne can settle down at the center as an outcome of solidification. The gravitational energy released by this process keeps the white dwarf warm for 2 Gyr, thus delaying the cooling process by a similar amount.

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