Observation of Kilohertz Quasi-periodic Oscillations from the Atoll Source 4U 1702-429 by the Rossi X-Ray Timing Explorer

Details Observation of Kilohertz Quasi-periodic Oscillations from the Atoll Source 4U 1702-429 by the Rossi X-Ray Timing Explorer Observation of Kilohertz Quasi-periodic Oscillations from the Atoll Source 4U 1702-429 by the Rossi X-Ray Timing Explorer

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...512l.125m&link_type=abstract

The Astrophysical Journal, Volume 512, Issue 2, pp. L125-L129.

Astronomy and Astrophysics

Astronomy

62

Accretion, Accretion Disks, Stars: Individual (4U 1702-429), Stars: Neutron

Scientific paper

We present results of Rossi X-Ray Timing Explorer observations of the atoll source 4U 1702-429 in the middle of its luminosity range. Kilohertz-range quasi-periodic oscillations (QPOs) were observed first as a narrow (FWHM~7 Hz) peak near 900 Hz and later as a pair consisting of a narrow peak in the range of 625-825 Hz and a faint, broad (FWHM=91 Hz) peak. When the two peaks appeared simultaneously, the separation was 333+/-5 Hz. Six type I thermonuclear bursts were detected, of which five exhibited almost coherent oscillations near 330 Hz, which makes 4U 1702-429 only the second source to show burst oscillations very close to the kilohertz QPO separation frequency. The energy spectrum and color-color diagram indicate that the source executed variations in the range between the ``island'' and ``lower banana'' atoll states. In addition to the kilohertz variability, oscillations at ~10, ~35, and 80 Hz were also detected at various times, superposed on a red noise continuum. The centroid of the ~35 Hz QPO tracks the frequency of the kilohertz oscillation when they were both present. A Lense-Thirring gravitomagnetic precession interpretation appears more plausible in this case, compared with other atoll sources with low-frequency QPOs.

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