| Autor: |
Christopher A. Tout, H. Rovithis-Livaniou, O. M. Bitzaraki |
| Rok vydání: |
2003 |
| Předmět: |
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| Zdroj: |
New Astronomy. 8:23-28 |
| ISSN: |
1384-1076 |
| DOI: |
10.1016/s1384-1076(02)00199-9 |
| Popis: |
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 M ⊙ and a low companion mass in the range 1.5–3.0 M ⊙ . 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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect