Statistics – Computation
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.293..177b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 293, p. 177
Statistics
Computation
48
Helium, Stellar Evolution, White Dwarf Stars, Hydrogen, Stellar Envelopes, Stellar Cores, Pulsars, Equations Of State, Hertzsprung-Russell Diagram
Scientific paper
The present study is aimed at exploring the effects of hydrogen envelopes on the structure and evolution of low- and intermediate-mass, helium white dwarfs. To this end, we compute the evolution of models of helium white dwarfs with masses ranging from 0.15 to 0.5 solar masses for low and intermediate effective temperatures. The calculations are carried out by means of a detailed white dwarf evolutionary code in which updated radiative opacities and equations of state for hydrogen and helium plasmas are considered. We also take into account both convective mixing in the outer layers occurring at low luminosities and the presence of hydrogen burning at the bottom of the hydrogen-rich envelope by means of the inclusion of a detailed network of thermonuclear reaction rates. Our attention is focused mainly on that phase of evolution where finite-temperature effects are particularly significant. We find that thick hydrogen envelopes appreciably modify the radii and surface gravity of the nonhydrogen models, especially in the case of low-mass configurations. The computations presented here represent the most detailed models of helium white dwarfs with hydrogen envelopes presently available.
Althaus Leandro G.
Benvenuto Omar G.
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