Kilohertz Quasi-periodic Oscillation and Atoll Source States in 4U 0614+09

Details Kilohertz Quasi-periodic Oscillation and Atoll Source States in 4U 0614+09 Kilohertz Quasi-periodic Oscillation and Atoll Source States in 4U 0614+09

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...485l..37m&link_type=abstract

Astrophysical Journal Letters v.485, p.L37

Astronomy and Astrophysics

Astronomy

39

Accretion, Accretion Disks, Stars: Neutron, Stars: Individual Alphanumeric: 4U 0614+091, X-Rays: Stars

Scientific paper

We report three RXTE/PCA observations of the low-mass X-ray binary 4U 0614+09. They show strong (~30% rms) band-limited noise with a cutoff frequency varying between 0.7 and 15 Hz in correlation with the X-ray flux, fX. We observe two nonsimultaneous 11%--15% (rms) kHz peaks near 728 and 629 Hz in the power spectra of two of our observations when fX ~ 10-9 ergs cm-2 s-1 (2--10 keV) but find no quasi-periodic oscillations (QPOs; <6% rms) when fX is half that. We suggest that count rate may not be a good measure for M dot even in sources as intrinsically weak as 4U 0614+09 and that QPO frequency and noise cutoff frequency track M dot more closely than count rate. The QPO increases in rms amplitude from 11% +/- 1.3% at 3 keV to 37% +/- 12% at 23 keV; the fractional amplitude of the band-limited noise is energy independent. This suggests different sites of origin for these two phenomena. The spectrum of the oscillating flux roughly corresponds to a black body with temperature 1.56 +/- 0.2 keV and radius 500 +/- 200 m (other models fit as well), which might indicate that the oscillations originate at a small region on the neutron star surface.

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