Maxwell, Diana H.; Norton, Andrew J. and Roche, Paul
OAO1657-415: A `missing link' in high-mass X-ray binaries?
In: Evolution of Binary and Multiple Star Systems; a meeting in celebration of Peter Eggleton's 60th birthday, 25 June - 1 July 2000, Bormio, Italy.
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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