Possible evidence of quark matter in neutron star X-ray binaries

Details Possible evidence of quark matter in neutron star X-ray binaries Possible evidence of quark matter in neutron star X-ray binaries

2000-03-28

arxiv.org/abs/astro-ph/0003426v2

Astrophys.J. 559 (2001) L119

Astronomy and Astrophysics

Astrophysics

4 pages (latex) 3 figures. Figure of calculated distribution of x-ray neutron stars as a function of frequency is included

Scientific paper

10.1086/323972

We study the spin evolution of X-ray neutron stars in binary systems, which are being spun up by mass transfer from accretion disks. Our investigation reveals that a quark phase transition resulting from the changing central density induced by the changing spin, can lead to a pronounced peak in the frequency distribution of X-ray neutron stars. This finding provides one of several possible explanations available in the literature, or at least a contributor to part of the observed anomalous frequency distribution of neutron stars in low-mass X-ray binaries (LMXBs), which lie in a narrow band centered at about 300 Hz, as found by the Rossi Explorer (RXTE).

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