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2012MNRAS.422..199M - Mon. Not. R. Astron. Soc., 422, 199-206 (2012/May-1)
The evolution and masses of the neutron star and donor star in the high mass X-ray binary OAO 1657-415.
MASON A.B., CLARK J.S., NORTON A.J., CROWTHER P.A., TAURIS T.M., LANGER N., NEGUERUELA I. and ROCHE P.
Abstract (from CDS):
Cross-correlation methods were employed to construct a RV curve with a semi-amplitude of 22.1 ±3.5 km/s. Combined with other measured parameters of this system it provides a dynamically determined neutron star (NS) mass of 1.42±0.26 M☉ and a mass of 14.3±0.8 M☉for the Ofpe/WN9 highly evolved donor star.
OAO 1657-415 is an eclipsing HMXB pulsar with the largest eccentricity and orbital period of any within its class. Of the 10 known eclipsing X-ray binary pulsars OAO 1657-415 becomes the ninth with a dynamically determined NS mass solution and only the second in an eccentric system. Furthermore, the donor star in OAO 1657-415 is much more highly evolved than the majority of the supergiant donors in other HMXBs, joining a small but growing list of HMXBs donors with extensive hydrogen depleted atmospheres.
Considering the evolutionary development of OAO 1657-415, we have estimated the binding energy of the envelope of the mass donor and find that there is insufficient energy for the removal of the donor's envelope via spiral-in, ruling out a common envelope evolutionary scenario. With its non-zero eccentricity and relatively large orbital period the identification of a definitive evolutionary pathway for OAO 1657-415 remains problematic, we conclude by proposing two scenarios which may account for OAO 1657-415 current orbital configuration.
Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS
Journal keyword(s): binaries: eclipsing - binaries: general - stars: individual: OAO 1657-415 - stars: massive - stars: Wolf-Rayet - X-rays: binaries
Simbad objects: 15
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