The M Supergiant High-mass X-Ray Binary 4U 1954+31

@article{Hinkle2020TheMS,
  title={The M Supergiant High-mass X-Ray Binary 4U 1954+31},
  author={Kenneth H. Hinkle and Thomas Lebzelter and Francis C. Fekel and Oscar Straniero and Richard Joyce and Lisa Prato and Nicole Karnath and Nolan M. Habel},
  journal={arXiv: Solar and Stellar Astrophysics},
  year={2020}
}
The X-ray binary 4U 1954+31 has been classified as a Low Mass X-ray Binary (LMXB) containing a M giant and a neutron star (NS). It has also been included in the rare class of X-ray symbiotic binaries (SyXB). The Gaia parallax, infrared colors, spectral type, abundances, and orbital properties of the M star demonstrate that the cool star in this system is not a low mass giant but a high mass M supergiant. Thus, 4U 1954+31 is a High Mass X-ray Binary (HMXB) containing a late-type supergiant. It… 

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