The 'noisy' pulsar in HER X-1

Details The 'noisy' pulsar in HER X-1 The 'noisy' pulsar in HER X-1

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...245l..29b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 245, no. 2, May 1991, p. L29-L31.

Astronomy and Astrophysics

Astrophysics

2

Neutron Stars, Pulsars, X Ray Binaries, Exosat Satellite, Hercules Nova

Scientific paper

The results of a comparative analysis of coherent and noncoherent variations in the X-ray emission of Hercules X-1 are presented, based on Exosat archive data. In the broad band power spectrum of the source a strong noise component, variable with the 35-days cycle, is present. These changes, and the relation between the noise rms and the pulsed rms, can be interpreted as the effect of the presence of a scattering medium with variable optical depth. The results are compared with current models for the production of the noise and for the origin of the long term cycle.

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