A millisecond pulsar in an eclipsing binary

@article{Fruchter1988AMP,
  title={A millisecond pulsar in an eclipsing binary},
  author={Andrew S. Fruchter and Daniel R. Stinebring and J. H. Taylor},
  journal={Nature},
  year={1988},
  volume={333},
  pages={237-239}
}
We have discovered a remarkable pulsar with period 1.6 ms, moving in a nearly circular 9.17-h orbit around a low-mass companion star. At an observing frequency of 430 MHz, the pulsar, PSR1957 + 20, is eclipsed once each orbit for about 50 minutes. For a few minutes before an eclipse becomes complete, and for more than 20 minutes after the signal reappears, the pulses are delayed by as much as several hundred microseconds—presumably as a result of propagation through plasma surrounding the… 
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