Spectral and Timing Nature of the Symbiotic X-Ray Binary 4U 1954+319: The Slowest Rotating Neutron Star in AN X-Ray Binary System

@article{Enoto2014SpectralAT,
  title={Spectral and Timing Nature of the Symbiotic X-Ray Binary 4U 1954+319: The Slowest Rotating Neutron Star in AN X-Ray Binary System},
  author={Teruaki Enoto and Makoto Sasano and Shinya Yamada and Toru Tamagawa and K. Makishima and Katja Pottschmidt and Diana M. Marcu and Robin Corbet and Felix Fuerst and J{\"o}rn Wilms},
  journal={The Astrophysical Journal},
  year={2014},
  volume={786},
  pages={127}
}
The symbiotic X-ray binary (SyXB) 4U 1954+319 is a rare system hosting a peculiar neutron star (NS) and an M-type optical companion. Its ~5.4 hr NS spin period is the longest among all known accretion-powered pulsars and exhibited large (~7%) fluctuations over 8 yr. A spin trend transition was detected with Swift/BAT around an X-ray brightening in 2012. The source was in quiescent and bright states before and after this outburst based on 60 ks Suzaku observations in 2011 and 2012. The observed… 
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TLDR
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