The fundamental cyclotron line in 4U 1538-52

Details The fundamental cyclotron line in 4U 1538-52 The fundamental cyclotron line in 4U 1538-52

2009-10-23

arxiv.org/abs/0910.4484v1

Lecture notes and essays in astrophysics, vol. 3, 2008, 189

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

11 pages, 5 figures, Proceedings of the 3rd Symposium of the Astrophysics Group of the Spanish Royal Physical Society (Real So

Scientific paper

We present pulse phase averaged spectra of the high mass X-ray binary pulsar 4U 1538-52/QV Nor. Observations of this persistent accreting pulsar were made with the Rossi X-ray Timing Explorer (RXTE). We study the variability of cyclotron resonant scattering feature (CRSF or simply cyclotron line) in the high energy spectra of this binary system. We show that the parameters of the CRSF are correlated. The first one is, as suggested by theory, between the width and the energy of the cyclotron line. The second one is between the relative width and the optical depth of the cyclotron line. We discuss these results with studies of other X-ray pulsars and their implications on the line variability.

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