Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007mnras.382..779p&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 382, Issue 2, pp. 779-792.
Astronomy and Astrophysics
Astronomy
36
Stars: Evolution, Stars: Interiors, White Dwarfs
Scientific paper
We study the full evolution of low-mass white dwarfs with helium and oxygen cores. We revisit the age dichotomy observed in many white dwarf companions to millisecond pulsar on the basis of white dwarf configurations derived from binary evolution computations. We evolve 11 dwarf sequences for helium cores with final masses of 0.1604, 0.1869, 0.2026, 0.2495, 0.3056, 0.3333, 0.3515, 0.3844, 0.3986, 0.4160 and 0.4481Msolar. In addition, we compute the evolution of five sequences for oxygen cores with final masses of 0.3515, 0.3844, 0.3986, 0.4160 and 0.4481Msolar. A metallicity of Z = 0.02 is assumed. Gravitational settling, chemical and thermal diffusion are accounted for during the white dwarf regime. Our study reinforces the result that diffusion processes are a key ingredient in explaining the observed age and envelope dichotomy in low-mass helium-core white dwarfs, a conclusion we arrived at earlier on the basis of a simplified treatment for the binary evolution of progenitor stars. We determine the mass threshold where the age dichotomy occurs. For the oxygen white dwarf sequences, we report the occurrence of diffusion-induced, hydrogen-shell flashes, which, as in the case of their helium counterparts, strongly influence the late stages of white dwarf cooling. Finally, we present our results as a set of white dwarf mass-radius relations for helium and oxygen cores.
Althaus Leandro G.
Chen Xingming
Han Zhangang
Panei Jorge A.
No associations
LandOfFree
Full evolution of low-mass white dwarfs with helium and oxygen cores does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Full evolution of low-mass white dwarfs with helium and oxygen cores, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Full evolution of low-mass white dwarfs with helium and oxygen cores will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1017370