Completing the puzzle of the 2004-2005 outburst in V0332+53: the brightening phase included

Details Completing the puzzle of the 2004-2005 outburst in V0332+53: the brightening phase included Completing the puzzle of the 2004-2005 outburst in V0332+53: the brightening phase included

2009-09-29

arxiv.org/abs/0909.5379v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

9 pages, 10 figures, accepted for publication in MNRAS

Scientific paper

Analysis of the data obtained with the RXTE observatory during a powerful outburst of the X-ray pulsar V0332+53 in 2004-2005 is presented. Observational data covering the outburst brightening phase are analysed in detail for the first time. A comparison of source parameters and their evolution during the brightening and fading phases shows no evidence for any hysteresis behaviour. It is found that the dependences of the energy of the cyclotron absorption line on the luminosity during the brightening and fading phases are almost identical. The complete data sequence including the outburst brightening and fading phases makes it possible to impose the more stringent constraints on the magnetic field in the source. The pulse profile and pulsed fraction are studied as functions of the luminosity and photon energy.

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