Discovery of the Orbit of the X-ray pulsar OAO 1657-415

Details Discovery of the Orbit of the X-ray pulsar OAO 1657-415 Discovery of the Orbit of the X-ray pulsar OAO 1657-415

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...403l..33c&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 403, no. 1, p. L33-L37.

Astronomy and Astrophysics

Astrophysics

51

Eclipsing Binary Stars, Pulsars, Stellar Orbits, X Ray Stars, Gamma Ray Observatory, Stellar Mass, Stellar Mass Accretion, Supergiant Stars

Scientific paper

Timing observations of the 38 s accreting X-ray pulsar OAO 1657-415 made with the BATSE large-area detectors on the Compton Gamma Ray Observatory have revealed a binary orbit with an X-ray eclipse by the stellar companion. From the pulsar mass function fx(M) = 11.7 +/- 0.2 solar masses and the measured eclipse half-angle theta(e) = 29.7 +/- 1.3 deg, we infer that the stellar companion is a supergiant of spectral class B0-B6. If the companion can be identified and its orbital velocity measured, the neutron star mass can be constrained. Both intrinsic spin-up and spin-down of the pulsar were measured during our observation.

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