BeppoSAX observation of the X-ray pulsar 4U 1538-52

Details BeppoSAX observation of the X-ray pulsar 4U 1538-52 BeppoSAX observation of the X-ray pulsar 4U 1538-52

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..510..213r&link_type=abstract

THE FIFTH COMPTON SYMPOSIUM. AIP Conference Proceedings, Volume 510, pp. 213-216 (2000).

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Pulsars, X-Ray Binaries, X-Ray

Scientific paper

We report preliminary results of the temporal and spectral analysis performed on the X-ray pulsar 4U1538-52 out of eclipse observed by BeppoSAX. We obtain a new estimate of the pulse period of the neutron star P=528.24+/-0.01 s (corrected for the orbital motion of the X-ray source): the source is still in the spin-up state, as since 1988. The broad band (0.12-100 keV) spectral analysys shows the presence of an absorption feature at ~21 keV is present, interpreted as due to cyclotron resonant scattering. Another absorption feature at ~51 keV seems also to be present (at 99% confidence level). If confirmed this might be interpreted as a cyclotron line, but its energy is not compatible with being double than the energy of the first line. .

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