Mass-radius relations for massive white dwarf stars

We present detailed theoretical mass-radius relations for massive white dwarf stars with oxygen-neon cores. This work is motivated by recent observational evidence about the existence of white dwarf stars with very high surface gravities. Our results are based on evolutionary calculations that take...

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Published in:Astronomy and astrophysics (Berlin) 2005-10, Vol.441 (2), p.689-694
Main Authors: Althaus, L. G., García-Berro, E., Isern, J., Córsico, A. H.
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Language:English
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stars: evolution
stars: fundamental parameters
stars: white dwarfs
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description We present detailed theoretical mass-radius relations for massive white dwarf stars with oxygen-neon cores. This work is motivated by recent observational evidence about the existence of white dwarf stars with very high surface gravities. Our results are based on evolutionary calculations that take into account the chemical composition expected from the evolutionary history of massive white dwarf progenitors. We present theoretical mass-radius relations for stellar mass values ranging from 1.06 to $1.30\, M_{\odot}$ with a step of $0.02\, M_{\odot}$ and effective temperatures from 150 000 K to ≈5000 K. A novel aspect predicted by our calculations is that the mass-radius relation for the most massive white dwarfs exhibits a marked dependence on the neutrino luminosity. Extensive tabulations for massive white dwarfs, accessible from our web site, are presented as well.
doi_str_mv 10.1051/0004-6361:20052996
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subjects stars: evolution
stars: fundamental parameters
stars: white dwarfs
title Mass-radius relations for massive white dwarf stars
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