Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...493..368k&link_type=abstract
Astrophysical Journal v.493, p.368
Astronomy and Astrophysics
Astronomy
22
Stars: Binaries: Close, Stars: Pulsars: General, Stars: Evolution, Stars: Neutron, Stars: Supernovae: General, X-Rays: Stars
Scientific paper
We propose a new formation mechanism (direct-supernova) for low-mass X-ray binaries (LMXBs) that does not involve any prior phase of mass transfer. Survival through the supernova (SN) explosion and shrinkage of the orbit is achieved by a kick velocity of appropriate magnitude and direction imparted to the neutron star at its birth. We present analytical population synthesis calculations of LMXBs forming via both the direct-SN and the helium star SN mechanisms and compare the results. We find that the direct-SN channel contributes a nonnegligible fraction of the total LMXB population, depending strongly on the rms magnitude of the kick velocity. More importantly, the direct-SN mechanism provides a natural way for the formation of low-mass binary pulsars in nearly circular orbits with orbital periods in excess of ~100d, which cannot have been formed via the helium star SN mechanism.
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