A Method to Search for Black Hole Candidates with Giant Companions by LAMOST

@article{Gu2019AMT,
  title={A Method to Search for Black Hole Candidates with Giant Companions by LAMOST},
  author={Weimin Gu and Hui-Jun Mu and Jin-Bo Fu and Ling-Lin Zheng and Tuan Yi and Zhong-rui Bai and Song-Yun Wang and Haotong Zhang and Yajuan Lei and Yu Bai and Jianfeng Wu and Junfeng Wang and Jifeng Liu},
  journal={The Astrophysical Journal},
  year={2019}
}
We propose a method to search for stellar-mass black hole (BH) candidates with giant companions from spectroscopic observations. Based on the stellar spectra of LAMOST Data Release 6, we obtain a sample of seven giants in binaries with large radial velocity variation $\Delta V_R > 80~{\rm km~s^{-1}}$. With the effective temperature, surface gravity, and metallicity provided by LAMOST, and the parallax given by {\it Gaia}, we can estimate the mass and radius of the giant, and therefore evaluate… 
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