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Preprint 13h/99

Multiple Cyclotron Lines in the Spectrum of 4U 0115+63

W.A. Heindl (1), W. Coburn (1), D.E. Gruber (1), M. Pelling (1), R.E. Rothschild (1), J. Wilms (2), K. Pottschmidt (2), and R. Staubert (2)

(1) Center for Astrophysics and Space Sciences, University of California San Diego, La Jolla, CA, 92093, USA
(2) Institut für Astronomie und Astrophysik, Astronomie, Universität Tübingen, Waldhäuser Str. 64, D-72076 Tübingen, Germany

To appear in: Proc. of the 5th Compton Symposium, ed. M. McConnell

Abstract. We report phase resolved spectroscopy of the transient accreting pulsar, 4U 0115+63. For the first time, more than two cylotron resonance scattering features are detected in the spectrum of an X-ray pulsar. The shape of the fundamental line appears to be complex, and this is in agreement with predictions of Monte­Carlo models. As in other pulsars, the line energies and optical depths are strong functions of pulse phase. One possible model for this is an offset of the dipole of the neutron star magnetic field.

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Paper (105k gzip'ed Postscript including figures)

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