A New Class of High-Mass X-ray Binaries: Implications for Core Collapse and Neutron-Star Recoil

Details A New Class of High-Mass X-ray Binaries: Implications for Core Collapse and Neutron-Star Recoil A New Class of High-Mass X-ray Binaries: Implications for Core Collapse and Neutron-Star Recoil

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.9508p&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #95.08; Bulletin of the American Astronomical Society, Vol. 33, p.1446

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We investigate the statistical significance and implications of a new class of high-mass X-ray binaries (HMXBs), with Porb > 30 days and e < 0.2. The orbital parameters suggest that the neutron stars in these systems did not receive a very large kick at the time of formation. We develop a scenario wherein the neutron stars born in the new class of HMXBs receive kick speeds of only < 50 km/s, while neutron stars born in isolation and in low-mass X-ray binaries receive the conventional large kicks of 200-300 km/s. This apparent dichotomy may be explained if the kick speed depends on the rotation rate of the pre-collapse core, such that rapidly rotating core yield small kicks, and vice versa for slowly rotating cores.

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