The X-ray absorption spectrum of Vela X-1

@inproceedings{Haberl1990TheXA,
  title={The X-ray absorption spectrum of Vela X-1},
  author={Frank Haberl and Nicholas E. White},
  year={1990}
}
Exosat observations of the massive X-ray binary Vela X-1 are spectrally analyzed. The absorbing column density shows erratic factor of 10 increases up to 5 x 10 to the 23rd H/sq cm that can occur at any orbital phase and last from minutes to many hours. These variations occur on top of a base level of absorption that increases from 3 x 10 to the 22nd H/sq cm to 15 x 10 to the 22nd H/sq cm from orbital phase about 0.2 to 0.85. It is suggested that these changes are due to intermittent formation… CONTINUE READING

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