An OSSE Observation of Soft Gamma-Ray Emission from A0535+26

Details An OSSE Observation of Soft Gamma-Ray Emission from A0535+26 An OSSE Observation of Soft Gamma-Ray Emission from A0535+26

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.0908g&link_type=abstract

American Astronomical Society, 184th AAS Meeting, #09.08; Bulletin of the American Astronomical Society, Vol. 26, p.872

Astronomy and Astrophysics

Astronomy

Scientific paper

The Oriented Scintillation Spectrometer Experiment (OSSE) on GRO observed the X-ray binary pulsar A0535+26 from 8-17 February 1994, during the rising portion of an unusually strong outburst. We find that the phase-averaged spectrum shows interesting structure above 100 keV and cannot be described by a single-component model. Lightcurves near 50 keV show a double-peaked pulse profile, and pulse-phase spectroscopy indicates significant spectral dependence on phase. We will present both phase-averaged and phase-resolved spectroscopy, plus time histories of the observed flux. We will show whether spectra can be interpreted in terms of a cyclotron absorption feature and/or the emergence of an underlying hard component. We will also discuss evolution of the spectral shape over the course of the observation.

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