SIMBAD references

2017ApJ...850..106P - Astrophys. J., 850, 106-106 (2017/November-3)

The spin distribution of fast-spinning neutron stars in low-mass X-ray binaries: evidence for two subpopulations.


Abstract (from CDS):

We study the current sample of rapidly rotating neutron stars in both accreting and non-accreting binaries in order to determine whether the spin distribution of accreting neutron stars in low-mass X-ray binaries (LMXBs) can be reconciled with current accretion torque models. We perform a statistical analysis of the spin distributions and show that there is evidence for two subpopulations among LMXBs, one at a relatively low spin frequency, with an average of ~300 Hz and a broad spread, and a peaked population at higher frequency with an average spin frequency of ~575 Hz. We show that the two subpopulations are separated by a cut-point at a frequency of ~540 Hz. We also show that the spin frequency of radio millisecond pulsars (RMSPs) does not follow a log-normal distribution and shows no evidence for the existence of distinct subpopulations. We discuss the uncertainties of different accretion models and speculate that either the accreting neutron star cut-point marks the onset of gravitational waves as an efficient mechanism to remove angular momentum or some of the neutron stars in the fast subpopulation do not evolve into RMSPs.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): binaries: general - gravitational waves - stars: neutron - stars: pulsars: general - X-rays: binaries - X-rays: stars - X-rays: stars

Simbad objects: 30

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