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2004MNRAS.352..249B - Mon. Not. R. Astron. Soc., 352, 249-257 (2004/July-3)
The formation of a helium white dwarf in a close binary system with diffusion.
BENVENUTO O.G. and DE VITO M.A.
Abstract (from CDS):
In order to study the interplay of mass loss episodes and diffusion we considered evolutionary sequences with and without diffusion in which all Roche lobe overflows (RLOFs) produce mass transfer. Another two sequences in which thermonuclearly driven RLOFs were not allowed to drive mass transfer have been computed with and without diffusion. As far as we are aware, this study represents the first binary evolution calculations in which diffusion is considered.
The system produces a helium white dwarf of ∼0.21 M☉ in an orbit with a period of ∼4.3 d for the four cases. We find that mass transfer episodes induced by hydrogen thermonuclear flashes drive a tiny amount of mass transfer. As diffusion produces stronger flashes, the amount of hydrogen-rich matter transferred is slightly higher than in the models without diffusion.
We find that diffusion is the main agent in determining the evolutionary time-scale of low-mass white dwarfs even in the presence of mass transfer episodes.
Abstract Copyright: 2004 RAS
Journal keyword(s): binaries: general - stars: evolution - stars: interiors
CDS comments: p.250: PSR J02018+4232 is a misprint for J0218+4232
Simbad objects: 6
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