Study of the accreting pulsar 4U 0115+63 using a bulk and thermal Comptonization model C. Ferrigno, P. A. Becker, A. Segreto, T. Mineo and A. Santangelo A&A, 498 3 (2009) 825-836 Published online: 19 March 2009 DOI: 10.1051/0004-6361/200809373