Time-resolved spectroscopy of the M15 X-ray binary AC211/X2127+119

  title={Time-resolved spectroscopy of the M15 X-ray binary AC211/X2127+119},
  author={M.A.P.Torres and Paul J. Callanan and Middlebury College and Cork and Ireland Harvard-Smithsonian Center for Astrophysics},
  journal={Monthly Notices of the Royal Astronomical Society},
We present time-resolved spectroscopy acquired during two epochs (spaced apart by ∼15 d) of the eclipsing low-mass X-ray binary AC211/X2127+119 in the globular cluster M15. The spectra show variations in the Hell λ4686 emission line not only modulated on the orbital period, but also on time-scales of a few days. During the first epoch of observation, the emission line shows a strong S-wave superimposed on the average double-peaked profile. The line exhibits no evidence of rotational disturbance… 

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