Do LMXBs contain strange stars?

Details Do LMXBs contain strange stars? Do LMXBs contain strange stars?

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...344l..71b&link_type=abstract

Astronomy and Astrophysics, v.344, p.L71-L74 (1999)

Astronomy and Astrophysics

Astrophysics

20

Dense Matter, Equation Of State, Stars: Binaries: General, X-Rays: Stars

Scientific paper

{It has been suggested that low mass X-ray binaries (LMXBs) contain strange (quark) stars. We show that the properties of bulk strange matter are severely constrained if the recently discovered kilohertz quasi periodic oscillations (QPOs) of the X-ray flux from LMXBs occur at orbital frequencies around strange stars. In particular, the simplest equation of state of strange matter is ruled out if the observed saturation (at 1.07 kHz) of the QPO frequency in 4U 1820-30 occurs at the orbital frequency either just outside the surface of the strange star or in the innermost (marginally) stable orbit allowed by general relativity.}

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