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19 April 2024

» arxiv » astro-ph/0511288

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RXTE Discovery of Multiple Cyclotron Lines during the 2004 December Outburst of V0332+53
K. Pottschmidt ; I. Kreykenbohm ; J. Wilms ; W. Coburn ; R.E. Rothschild ; P. Kretschmar ; V. McBride ; S. Suchy ; R. Staubert ;
Date:	9 Nov 2005
Journal:	Astrophys.J. 634 (2005) L97-L100
Abstract:	We present an analysis of the 2-150 keV spectrum of the transient X-ray pulsar V0332+53 taken with the Rossi X-Ray Timing Explorer (RXTE) in 2004 December. We report on the detection of three cyclotron resonance features at 27, 51, and 74 keV in the phase-averaged data, corresponding to a polar magnetic field of 2.7 x 10^12 G. After 4U0115+63, this makes V0332+53 the second accreting neutron star in which more than two cyclotron lines have been detected; this has now also been confirmed by INTEGRAL. Pulse-phase spectroscopy reveals remarkably little variability of the cyclotron line through the 4.4 s X-ray pulse.
Source:	arXiv, astro-ph/0511288
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