Cygnus X-2, super-Eddington mass transfer, and pulsar binaries

@article{King1998CygnusXS,
  title={Cygnus X-2, super-Eddington mass transfer, and pulsar binaries},
  author={Andrew King and Hans Georg Ritter},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={1998},
  volume={309},
  pages={253-260}
}
  • A. KingH. Ritter
  • Published 18 December 1998
  • Physics
  • Monthly Notices of the Royal Astronomical Society
We consider the unusual evolutionary state of the secondary star in Cygnus X-2. Spectroscopic data give a low mass (M2 . 0:5 2 0:7 M() and yet a large radius (R2 . 7 R() and high luminosity (L2 . 150 L(). We show that this star closely resembles a remnant of early massive Case B evolution, during which the neutron star ejected most of the , 3 M( transferred from the donor (initial mass M2i , 3:6 M() on its thermal timescale , 10 yr. As the system is far too wide to result from common-envelope… 

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