Absorption features in the hard X-ray spectra of PSR A 0535+26 and VELA X-1.

Details Absorption features in the hard X-ray spectra of PSR A 0535+26 and VELA X-1. Absorption features in the hard X-ray spectra of PSR A 0535+26 and VELA X-1.

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..120c.175k&link_type=abstract

Astronomy and Astrophysics Supplement, v.120, p.175-178

Astronomy and Astrophysics

Astrophysics

8

Pulsars: Individual: Psr A 0535+26 (Ao 0535+26), Pulsars: Individual: Vela X-1, Stars: Magnetic Fields, X-Rays: Stars

Scientific paper

We present the results of broad band (2-200keV), pulse-phase-resolved spectral analysis of A0535+26 and Vela X-1, observed by the instruments HEXE and TTM on Mir-KVANT. Both sources show a double peaked pulse profile at energies >10keV with pulses distinctly different in shape. Convincing evidence for cyclotron absorption features has been found for A0535+26, similar features - though less significant - are also found in the Vela X-1 spectra. For both sources these features are pulse phase dependent and occur especially strong in the pulse getting more prominent with increasing energy.

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