Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 448, Issue 3, Pages 2175-2186Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stv125
Keywords
pulsars: individual: V 0332+53; X-rays: binaries
Categories
Funding
- Russian Scientific Foundation [14-12-01287]
- RFBR [12-02-97006-r-povolzhe-a]
- Deutsche Forschungsgemeinschaft (DFG) [WE 1312/48-1]
- COST Action [MP1304]
- Magnus Ehrnrooth Foundation
- Deutsches Zentrums fur Luft-und Raumfahrt
- DFG [DLR 50 OR 0702]
- Saint Petersburg State University [6.0.22.2010, 6.38.669.2013, 6.38.18.2014]
- Academy of Finland [268740]
- Russian Science Foundation [14-12-01287] Funding Source: Russian Science Foundation
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We present the results of the pulse-phase- and luminosity-resolved spectroscopy of the transient X-ray pulsar V 0332+53, performed for the first time in a wide luminosity range (1-40) x 10(37) erg s(-1) during a giant outburst observed by the RXTE observatory in 2004 December-2005 February. We characterize the spectra quantitatively and built the detailed 'three-dimensional' picture of spectral variations with pulse phase and throughout the outburst. We show that all spectral parameters are strongly variable with the pulse phase, and the pattern of this variability significantly changes with luminosity directly reflecting the associated changes in the structure of emission regions and their beam patterns. Obtained results are qualitatively discussed in terms of the recently developed reflection model for the formation of cyclotron lines in the spectra of X-ray pulsars.
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