Abstract
Known periodicities in X-ray sources cover a wide range of values — a factor of 108 or 109 from the 33 mS of the Crab pulsar up to 35 days for the Her X-1 repeat of its up state, or even years if one believes in the not inconceivable idea that at least one “transient” (perhaps not yet even discovered!) is exhibiting some form of repetitive behaviour.These periodicities are not just astronomical curiosities to keep theoreticians busy speculating. They do have several solid uses which the mere experimenter can take advantage of. These uses do, inevitably overlap, and vary in importance according to whom one is speaking. In the short space available I will concentrate on recent measurements on X-ray sources showing Doppler modulated periodicities, and on sources which may well show such changes when they are studied more closely.
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Davison, P.J.N. (1977). Periods In X-Ray Sources. In: Müller, E.A. (eds) Highlights of Astronomy. International Astronomical Union / Union Astronomique Internationale, vol 4-1. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-1248-5_4
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DOI: https://doi.org/10.1007/978-94-010-1248-5_4
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