Evidence for cyclotron line features in high energy spectra of A 0535+26 during the March/April 1989 outburst

Details Evidence for cyclotron line features in high energy spectra of A 0535+26 during the March/April 1989 outburst Evidence for cyclotron line features in high energy spectra of A 0535+26 during the March/April 1989 outburst

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...291l..31k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 291, no. 2, p. L31-L34

Astronomy and Astrophysics

Astrophysics

53

Absorption Spectra, Cyclotron Resonance, Energy Spectra, High Energy Interactions, Pulsars, Stellar Magnetic Fields, Line Spectra, Mir Space Station, X Ray Stars

Scientific paper

The X-ray pulsar A 0535+26 has been observed during its March/April 1989 outburst with the Coded Mask Telescope TTM and the High Energy X-ray Experiment HEXE on board the Mir space station at energies between 4 and 156 keV. Pulsed emission (P = 103.26 s for JD 244 7626) has been detected up to at least 100 keV. Above 20 deV the time averaged pulse profiles show a clear double peak structure with an asymmetric main pulse and a more symmetric secondary pulse. The spectrum of the main pulse is significantly harder than that of the secondary pulse. The phase resolved spectra can only be fitted by a power law with exponetial cutoff modified by two absorption lines around 50 and 100 keV. We interpret these features as the fundamental and first harmonic cyclotron resonances. The corresponding strength of the magnetic field of the neutron star is 4.3 x 1012 Gauss.

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