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

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

Mar 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aca....60...75d&link_type=abstract

Acta Astronomica, vol 60, no 1, p. 75-82

Astronomy and Astrophysics

Astronomy

Pulsars: Individual: Oao 1657-415, Gamma Rays: Observations

Scientific paper

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 companion. We find that the density profile of the outer layer can be described by a power law with the index α=8.5. We also note that the fit hints toward smaller inclinations of the system within the allowed range 60°

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