SIMBAD references

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):

We report near-infrared radial velocity (RV) measurements of the recently identified donor star in the high mass X-ray binary (HMXB) system OAO 1657-415 obtained in the H band using ISAAC on the Very Large Telescope.

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 Mfor 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

Status at CDS:  

Simbad objects: 15

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2012MNRAS.422..199M and select 'bookmark this link' or equivalent in the popup menu


2020.05.26-03:36:40

© Université de Strasbourg/CNRS

    • Contact