A&A 391, 1033-1037 (2002)
A review of X-ray spectral evolution in Crab pulsarM. Vivekanand
National Center for Radio Astrophysics, TIFR, Pune University Campus, PO Box 3, Ganeshkhind, Pune 411007, India
(Received 22 April 2002 / Accepted 17 June 2002)
Pravdo et al. (1997) claimed that the phase resolved x-ray spectrum in Crab pulsar (PSR B0531+21) shows a spectral hardening at the leading edge of the first peak of its integrated profile (IP); this was a new and unexpected result. This article reanalyzes their data, as well as some other related data, and argues that the spectrum is as likely to be unvarying (i.e., neither hardening nor softening).
Key words: pulsars -- individual: PSR B0531+21 -- X-ray: stars -- phase resolved spectra
© ESO 2002