Thermohaline-mixing-binary evolution

Details Thermohaline-mixing-binary evolution Thermohaline-mixing-binary evolution

Jan 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003newa....8...23b&link_type=abstract

New Astronomy, Volume 8, Issue 1, p. 23-28.

Astronomy and Astrophysics

Astronomy

4

Scientific paper

We explore evolutionary scenarios for the formation of the Luminous Supersoft X-Ray Sources and of Low-Mass X-ray binary system (LMXBs). A subclass of the former systems is considered as candidates for Type Ia supernova explosions. We include the effect of thermohaline mixing in the evolutionary calculations of binary systems consisting of a donor of intermediate mass 7-8 Msolar and a low companion mass in the range 1.5-3.0 Msolar. Case C of mass transfer is followed by a CE phase. A self-consistent treatment of winds was also incorporated in the newer version of Eggleton's code. We keep track of the post-CE evolution during which the post-CE remnant of this star is examined to fill its Roche lobe during He shell burning. For the above case, if the diffusion time-scale is shorter than the evolutionary time scale, the companion accretes and mixes the transferred matter into its radiative outer layers by means of the so-called thermohaline mixing. This modifies the evolution of the systems with respect to that of systems without He-enrichment and reduces the number of Supersoft Systems by as much as 25-50 per cent. Also it increases the number of systems that will evolve to Type Ia supernova or a LMXB, but it is not (yet) possible to give a quantitative estimate of this increase.

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