Boost of the orbital motion in high mass X-ray binaries.

Details Boost of the orbital motion in high mass X-ray binaries. Boost of the orbital motion in high mass X-ray binaries.

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...314..576b&link_type=abstract

Astronomy and Astrophysics, v.314, p.576-584

Astronomy and Astrophysics

Astrophysics

7

Binaries: Close, Stars: Evolution, Stars: Mass Loss, Stars: Rotation, X-Rays, Stars

Scientific paper

We investigate the orbital behaviour of close high mass X-ray binaries (HMXBs), including the effects of the evolutionary growth of the moment of inertia and mass loss by stellar wind from the main-sequence star. We find that a nearly synchronous state implies in the context of tidal evolution a rapid decrease of the orbital period for binary systems close to the Darwin instability. In this frame, the observed orbital decays |˙(P)/P|>=10^-6^yr^-1^ in the Cen X-3 and SMC X-1 systems appear to be characteristic of synchronous HMXBs containing a neutron star. The rate of change in orbital period is expected to be one or two orders of magnitude smaller in close HMXBs with black hole candidates.

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