Pottschmidt, KatjaKreykenbohm, IngoWilms, JörnCoburn, WayneRothschild, Richard E.Kretschmar, PeterMcBride, VanessaSuchy, SlawomirStaubert, Rüdiger2023-10-112023-10-112005-11-02Pottschmidt, Katja, Ingo Kreykenbohm, Jörn Wilms, Wayne Coburn, Richard E. Rothschild, Peter Kretschmar, Vanessa McBride, Slawomir Suchy, and Rüdiger Staubert. “RXTE Discovery of Multiple Cyclotron Lines during the 2004 December Outburst of V0332+53.” The Astrophysical Journal 634, no. 1 (November 2, 2005): L97. https://doi.org/10.1086/498689.https://doi.org/10.1086/498689http://hdl.handle.net/11603/30076We 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 × 10¹² G. After 4U 0115+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.4 pagesen-USThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.Text