OAO 1657-415

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  • 4.8 year cycle of spin-up and spin-down phases ([1])
  • unique position in the Corbet diagram
  • maybe CRSF around 28keV ([2])

References

  1. Barnstedt J., Staubert, R., Santangelo, A., et al., 2008, A&A, 486, 293 (NASA ADS)
  2. Orlandini M., dal Fiume, D., del Sordo, S., et al., 1999, A&A, 349, L9 (NASA ADS)