Computer Science
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jena.confr..40t&link_type=abstract
"JENAM-2007, "Our non-stable Universe", held 20-25 August 2007 in Yerevan, Armenia. Abstract book, p. 40-40"
Computer Science
Scientific paper
We present the results of broad band (3-100 keV) observations of X-ray pulsars with INTEGRAL and RXTE observatories. We concentrate on the luminosity and energy dependence of pulse profiles, pulsed fraction and variations of the cyclotron line energy. In particular, in the source V0332+53 the line energy changes nearly linearly with the luminosity, while in 4U0115+63 its behavior is more complicated. It is firstly shown that the pulsed fraction dependence on the energy has an obvious feature near the cyclotron energy. Moreover, changes of the cyclotron energy with the luminosity are accompanied by changes of this feature. Strong variations of the pulse profile with the energy and source intensity were found for several pulsars; in V0332+53 the changes of the pulse profile near the cyclotron line are especially drastic. Results and possible emission mechanisms are briefly discussed in terms of theoretical models of accreting pulsars.
Lutovinov Alexander A.
Tsygankov Sergey
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