Correlations between X ray luminosity and pulse shape as well as spectral shape in binary X ray pulsars

Astronomy and Astrophysics – Astronomy

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Pulsars, Pulse Amplitude, Spectral Correlation, Stellar Luminosity, X Ray Binaries, Galaxies, Pulse Duration, Pulse Rate, Spectrum Analysis, Stellar Spectra, X Ray Spectra

Scientific paper

The correlations between X-ray luminosity and pulse shape and spectral shape in selected X-ray pulsars are presented to check proposed trends which were noted with changing luminosity between differents pulsars. Individual pulsars at different luminosity states are analyzed using archival data. In a sample of five different sources pulse profile changes are found in all sources. Only the low luminosity sources GX 301-2 and 4U 1538-52 show the expected change of complexity. The three other sources show indefinite results. Out of a sample of three different sources for which spectral analysis was performed, both low luminosity sources, GX 301-2 and Vela X-1 show the expected behavior: a steeper spectral cutoff in their higher luminosity state.

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