Nonperiodic intensity variations in the X-ray pulsar GX-301 - 2

Details Nonperiodic intensity variations in the X-ray pulsar GX-301 - 2 Nonperiodic intensity variations in the X-ray pulsar GX-301 - 2

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.252..156t&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 252, Sept. 1, 1991, p. 156-162.

Astronomy and Astrophysics

Astronomy

8

Binary Stars, Pulsars, Stellar Spectra, X Ray Stars, Absorption Spectra, Pulse Duration, Pulsed Radiation, Semiregular Variable Stars

Scientific paper

Results of Ginga observations of the X-ray binary pulsar GX301 - 1 are analyzed for their temporal and spectral properties in order to determine whether 'self-similar variation' (SSV) is a common phenomenon among X-ray pulsars. The unambiguous detection of aperiodic intensity variations of 7-10 percent rms relative amplitude over time-scales covering about 16 to 0.1 s is reported. These variations are self-similar, being well fitted by a power law in power spectral density versus frequency space. The pulse period measured is 689.80 s, the shortest measured for this source to date. The fraction of X-rays which is pulsed is energy dependent, being greater at higher energies. The fractional aperiodic variability shows no such energy dependence, nor do they appear to be significantly dependent on the source intensity, pulse phase, or absorbing column measured. It is inferred that the aperiodic variations are not caused by absorption variations, but are intrinsic to the source.

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