Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...526..953k&link_type=abstract
The Astrophysical Journal, Volume 526, Issue 2, pp. 953-956.
Astronomy and Astrophysics
Astronomy
9
Relativity, Stars: Individual (Scorpius X-1, 4U 1608-52), Stars: Oscillations, X-Rays: Stars
Scientific paper
The expected range of kilohertz quasi-periodic oscillations (kHz QPOs) is studied regarding low-mass X-ray binaries with twin peaks in their Fourier spectra. The twin peaks are interpreted as a combination of epicyclic and precesion frequencies in a Schwarzschild metric. If the pairs are caused by general relativistic orbital motion of gaseous clumps around a neutron star, then the moderate size of the clumps and the eccentricity of their orbits can account for the nonconstant peak separations reported in Scorpius X-1 and 4U 1608-52. The neutron star's mass comes out in the range of 1.6-1.9 Msolar. Variation in the orbital parameters of the clumps translates into an expected range in the plot of pair separation versus frequency, typically showing a decreasing slope.
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