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WD mass and orbital period relation of sdB + He WD binaries by Zhang, Yangyang; Chen, Hai-Liang; Xiong, Heran; Chen, Xuefei; Han, Zhanwen is a scholarly article available to read on EtoBox.

What is WD mass and orbital period relation of sdB + He WD binaries about?

Most subdwarf B (sdB) + Helium white dwarf (He WD) binaries are believed to be formed from a particular channel. In this channel, the He WDs are produced first from red giants (RGs) with degenerate cores via stable mass transfer and sdB stars are produced from RGs with degenerate cores via common envelope (CE) ejection. They are important for the studies of CE evolution, binary evolution, and binary population synthesis. However, the relation between WD mass and orbital period of sdB + He WD binaries has not been specifically studied. In this paper, we first use a semi-analytic method to follow their formation and find a WD mass and orbital period relation. Then we use a detailed stellar evolution code to model their formation from main-sequence binaries. We find a similar relation between the WD mass and orbital period, which is in broad agreement with observations. For most sdB + He WD systems, if the WD mass (orbital period) can be determined, the orbital period (WD mass) can be inferred with this relation and then the inclination angle can be constrained with the binary mass function. In addition, we can also use this relation to constrain the CE ejection efficiency and find th

Author

Zhang, Yangyang; Chen, Hai-Liang; Xiong, Heran; Chen, Xuefei; Han, Zhanwen

Published

2021

Language

EN