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Title:
kHz Quasi-Periodic Oscillations in the low-mass X-ray binary 4U 0614+09
Authors:
Boutelier, M.; Barret, D.; Miller, M. C.
Publication:
SF2A-2008: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: C. Charbonnel, F. Combes and R. Samadi. Available online at http://proc.sf2a.asso.fr, p.175
Publication Date:
11/2008
Origin:
AUTHOR
Bibliographic Code:
2008sf2a.conf..175B

Abstract

We report on a comprehensive analysis of the kilohertz (≥ 400 Hz) quasi-periodic oscillations (kHz QPOs) detected from the neutron star low-mass X-ray binary 4u with the {Rossi X-ray Timing Explorer} (RXTE). With a much larger data set than previously analyzed (all archival data from February 1996 up to October 2007), we first investigate the reality of the 1330 Hz QPO reported by van Straaten et al. (2000). This QPO is of particular interest since it has the highest frequency reported so far. A thorough analysis of the same observation fails to confirm the detection. On the other hand, over our extended data set, the highest QPO frequency we measure for the upper kHz QPO is at ˜ 1224 Hz; a value which is fully consistent with the maximum values observed in similar systems. Second, we demonstrate that the frequency dependence of the quality factor (Q=ν/Δν) and amplitude of the lower and upper kHz QPOs follow the systematic trends seen in similar systems. In particular, 4u shows a drop of the quality factor of the lower kHz QPO above ˜ 760 Hz. If this is due to an approach to the innermost stable circular orbit, it implies a neutron star mass of ˜ 1.9 M_ȯ.
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