Some properties of very low temperature, pure helium surface layers of degenerate dwarfs

Details Some properties of very low temperature, pure helium surface layers of degenerate dwarfs Some properties of very low temperature, pure helium surface layers of degenerate dwarfs

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...217..521b&link_type=abstract

Astrophysical Journal, Part 1, vol. 217, Oct. 15, 1977, p. 521-529. Research supported by the National Research Council of Cana

Astronomy and Astrophysics

Astrophysics

28

Cold Plasmas, Helium Plasma, Stellar Atmospheres, Stellar Models, Stellar Structure, White Dwarf Stars, Atmospheric Density, Dense Plasmas, Equations Of State, Opacity, Stellar Temperature, Surface Layers, Thomas-Fermi Model

Scientific paper

Models of the atmospheres and envelopes of degenerate dwarfs with pure He surface layers have been constructed using a hot Thomas-Fermi calculation of the opacity and equation of state. The models have log g of 8 and effective temperatures of 3000 to 6000 K, include the effects of convection even on the atmospheric structure at an optical depth of much less than unity, and extend inward to the point where the density is 1000 g/cu cm. Because of the high transparency, the densities in these atmospheres are so high that even the photospheres of the coolest models are degenerate. The calculations provide a preliminary calibration of the luminosity-core temperature relation for very cool degenerate dwarfs; stars with log g of approximately 8 and effective temperatures of no more than about 5000 K are found to have core temperatures more than a factor of 4 below their central Debye temperatures. The models also provide a preliminary survey of the low-temperature high-density region of the (density, temperature) plane relevant for studies of these stars and indicate a variety of physical phenomena that may be of importance in future studies of these stars

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