On the common envelope efficiency

In this work, we try to use the apparent luminosity versus displacement (i.e. L X versus R) correlation of high-mass X-ray binaries (HMXBs) to constrain the common envelope (CE) efficiency αCE, which is a key parameter affecting the evolution of the binary orbit during the CE phase. The major update...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2014-08, Vol.442 (3), p.1980-1991
Main Authors: Zuo, Zhao-Yu, Li, Xiang-Dong
Format: Article
Language:English
Subjects:
Star & galaxy formation
X-ray astronomy
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Summary:In this work, we try to use the apparent luminosity versus displacement (i.e. L X versus R) correlation of high-mass X-ray binaries (HMXBs) to constrain the common envelope (CE) efficiency αCE, which is a key parameter affecting the evolution of the binary orbit during the CE phase. The major updates that are crucial for the CE evolution include a variable λ parameter and a new CE criterion for Hertzsprung gap donor stars, both of which are recently developed. We find that, within the framework of the standard energy formula for CE and core definition at mass X = 10 per cent, a high value of αCE, i.e. around 0.8–1.0, is more preferable, while αCE 
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stu993