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  • 1
    Digitale Medien
    Digitale Medien
    X-ray variability of the pulsar Vela X-1 as observed with ART-P/Granat (2000)
    Springer
    Astronomy letters 26 (2000), S. 765-771 
    Details
    ISSN: 1562-6873
    Schlagwort(e): neutron stars ; pulsars ; X-ray sources
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Observations of the X-ray pulsar Vela X-1 with the ART-P telescope onboard the Granat Observatory are presented. Variability on a time scale of several thousand seconds was detected; intensity variations are shown to be accompanied by changes in the source’s spectrum. The hardness was also found to be highly variable on a scale of one pulsation period. The source’s spectrum exhibits an absorption feature at energy ∼7 keV, which is apparently attributable to cyclotron scattering/absorption in the neutron-star magnetic field. Weak persistent emission was detected during an X-ray eclipse, which probably resulted from the scattering of pulsar emission in the stellar wind from an optical star.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1134/1.1331156
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Spectral variability of the X-ray pulsar Hercules X-1 (2000)
    Springer
    Astronomy letters 26 (2000), S. 691-698 
    Details
    ISSN: 1562-6873
    Schlagwort(e): pulsars ; neutron stars ; X-ray sources ; scattering
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We present the results of our comparative timing and spectral analysis of the high and low (off) states in the X-ray pulsar Her X-1 based on data from the ART-P telescope onboard the Granat observatory. A statistically significant (several mCrab) persistent flux with a simple power-law spectrum was detected during the low state. The spectral slope changed from observation to observation by almost a factor of 2. Pulsations were detected only during the high state of the source, when its flux was a factor of ∼25 larger than the low-state flux. The spectral shape of Her X-1 in its high state was complex, with the parameters depending on pulse phase.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1134/1.1323276
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
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