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1999ApJ...521..341T - Astrophys. J., 521, 341-350 (1999/August-2)
XTE J2123-058: a new neutron star X-ray transient.
TOMSICK J.A., HALPERN J.P., KEMP J. and KAARET P.
Abstract (from CDS):
We detected a pair of high-frequency quasi-periodic oscillations (QPOs) at 847.1±5.5 Hz and 1102±13 Hz simultaneously. According to the beat-frequency model, this QPO separation implies a neutron star spin period of 3.92±0.22 ms. A change in the energy spectrum occurred during the decay of the outburst, which may have been due to the onset of the propeller mechanism. If so, then the neutron star magnetic field strength is between 2 and 8x108 G for an assumed distance of 10 kpc. However, the changes in the timing and spectral properties observed during the decay are typical of atoll sources, which may indicate that the changes are due solely to the dynamics of the accretion disk. As the phase-averaged V-band magnitude declined from 17.26 at the peak of the outburst to 19.24, and the X-ray flux decreased from 9.6x10–10 to 7.3x10–11 ergs.cm–2.s–1, the peak-to-peak amplitude of the V-band modulation increased from 0.75 to 1.49 mag. This behavior can be explained if the size of the accretion disk decreases during the decay of the outburst.
Abstract Copyright: ∼
Journal keyword(s): Accretion, Accretion Disks - Stars: Individual: Alphanumeric: XTE J2123-058 - Stars: Neutron - X-Rays: Bursts - X-Rays: Stars
Simbad objects: 1
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