OAO1657-415: A `missing link' in high-mass X-ray binaries?

Maxwell, Diana H.; Norton, Andrew J. and Roche, Paul (2001). 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 (Podsiadlowski, Ph.; Rappaport, S.; King, A.R.; D'Antona, F. and Burderi, L. eds.), ASP Conference Proceedings, Astronomical Society of the Pacific, pp. 495–502.

URL: http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bi...

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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