Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-11-09
Astrophys.J.634:L97-L100,2005
Astronomy and Astrophysics
Astrophysics
4 pages, 3 figures, accepted for publication in ApJ Letters
Scientific paper
10.1086/498689
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.
Coburn Wayne
Kretschmar Peter
Kreykenbohm Ingo
McBride Vanessa
Pottschmidt Katja
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