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INTEGRAL Observations of OAO 1657-415: Gamma-Ray Tomography of a B Super Giant

Bulik, T.; Denis, M.; Marcinkowski, R.

OAO 1657-415 is an accreting pulsar in an eclipsing binary system. We analyzed the INTEGRAL core program observations of this object and obtained the eclipse light curve in the soft gamma-ray band between 15 keV and 40 keV. We note that the gamma rays from the pulsar allow to probe the density profile of the outer layers of the B super giant compa…