Common envelope binaries and mass loss
نویسندگان
چکیده
منابع مشابه
A comprehensive population synthesis study of post-common envelope binaries
We apply population synthesis techniques to calculate the present day population of post-common envelope binaries (PCEBs) for a range of models describing the common envelope (CE) phase. This includes constant, global values of the CE ejection efficiency parameter αCE = 0.1 to 1.0, as well as considering it as a function of the secondary mass. We also use models where the values of λ (the giant...
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After the initial fast spiral-in phase experienced by a common-envelope binary, the system may enter a slow, self-regulated phase, possibly lasting 100s of years, in which all the energy released by orbital decay can be efficiently transported to the surface, where it is radiated away. If the remaining envelope is to be removed during this phase, this removal must occur through some as-yet-unde...
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Recent work on Cygnus X–2 strongly suggests that neutron–star or black hole binaries survive highly super–Eddington mass transfer rates without undergoing common–envelope evolution. We suggest here that the accretion flows in such cases are radiation–pressure dominated versions of the ‘ADIOS’ picture proposed by Blandford & Begelman (1999), in which almost all the mass is expelled from large ra...
متن کاملPeriod and amplitude variations in post-common-envelope eclipsing binaries observed with SuperWASP
Period or amplitude variations in eclipsing binaries may reveal the presence of additional massive bodies in the system, such as circumbinary planets. Here, we have studied twelve previously-known eclipsing post-common-envelope binaries for evidence of such light curve variations, on the basis of multi-year observations in the SuperWASP archive. The results for HW Vir provided strong evidence f...
متن کاملThe age , life expectancy , and space density of Post Common Envelope Binaries
We present a sample of 30 well observed Post Common Envelope Binaries (PCEBs). Deriving the cooling age of the white dwarfs, we show that the PCEB population is dominated by young systems. Having calculated the orbital evolution of the systems under the assumption of two different prescriptions for the angular momentum loss, we find that most of the systems have not yet completed a significant ...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1979
ISSN: 0074-1809
DOI: 10.1017/s0074180900013802