Neutron star mass through hydrodynamics in obscured sgHMXB systems

Obscured sgHMXB discovered by INTEGRAL are characterized by slow stellar winds.The gravity of the accreting neutron star has therefore an important impact onthe wind accretion flow. The variability of the absorbing column density withorbital phase and the long term Xray variability can be directly compared tothe predictions of hydrodynamical models to constrain the mass of the neutronstar, with an accuracy of a few tenth of solar mass, and the dynamics of theaccretion flow. We propose to observe an eclipsing absorbed sgHMXB with XMM toprobe the accretion flow, to obtain an independent measure of the NS mass and tofurther test our hydrodynamical model. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]