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OAO1657-415 : A `Missing Link' in High Mass X-ray Binaries?

D. H. Maxwell·A. J. Norton·P. Roche
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Abstract

OAO1657-415 is only the seventh eclipsing X-ray pulsar known and therefore has the potential to yield only the seventh mass of a neutron star in an X-ray binary. Here we report photometric and spectroscopic observations of candidates for the optical counterpart to the system and identify a B6V or B5III star as a possible companion to the neutron star. We measure the observational parameters of the star and suggest reasons why OAO1657-415 may be unlike other high mass X-ray binaries.

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D. H. Maxwell, A. J. Norton, P. Roche. 2000-11-22. OAO1657-415 : A `Missing Link' in High Mass X-ray Binaries?. https://arxiv.org/abs/astro-ph/0011401

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