Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-04-25
Astronomy and Astrophysics
Astrophysics
15 pages, 13 figures, accepted by Astronomy Reports
Scientific paper
We present a phase resolved spectral analysis of the X-ray binary 4U0115+63 based upon Beppo-Sax satellite observations. Three strong absorption lines have been detected at all phases. We interpreted them as a cyclotron resonant scattering. Existence of the fourth cyclotron line has been confirmed at some phases. The cyclotron feature is found to be strongly dependent on the phase of the source, while the continuum part of the spectrum depends on the phase relatively weakly. The cyclotron lines turned out to be very nonequidistant. The second line is almost always deeper then the first one. We discussed physical conditions in the active regions of the source, under which a cyclotron feature similar to the observed one can appear.
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