Muller, S.Kuhnel, M.Ferrigno, C.Kreykenbohm, I.Furst, F.Klochkov, D.Obst, M.Pottschmidt, KatjaSuchy, S.Rothschild, R.Caballero, I.Kretschmar, P.Schonherr, G.Wilms, J.Santangelo, A.Staubert, R.2023-09-212023-09-212011http://hdl.handle.net/11603/29804We report on an outburst of the high mass X-ray binary 4U 0115+634 with a pulse period of 3.6 s in 2008 as observed with INTEGRAL and RXTE. By analysing the lightcurves we derived an updated orbital period of the binary system. We also studied the pulse profile variations as a function of time and energy. We find evidence for phase lags at ∼11 and ∼22 keV. In our spectral analysis we found clear evidence for at least two cyclotron features. The continuum can be described by two different models, which lead to a fundamental difference in the behavior of the cyclotron features. We discuss possible reasons for this disagreement.1 pageen-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