Astronomy and Astrophysics – Astronomy
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...553..335j&link_type=abstract
The Astrophysical Journal, Volume 553, Issue 1, pp. 335-340.
Astronomy and Astrophysics
Astronomy
23
Accretion, Accretion Disks, Stars: Binaries: Close, Stars: Individual (2S 0918-549), Stars: Neutron, Stars: Oscillations, X-Rays: Stars
Scientific paper
We report the discovery of a kilohertz quasi-periodic oscillation (kHz QPO) in the low-mass X-ray binary (LMXB) 2S 0918-549. The kHz QPO has a frequency of 1156+/-9 Hz, an FWHM of 70+/-20 Hz, and a fractional rms amplitude of 18%+/-2%. We also detected for the first time a type I X-ray burst in this source. The compact object must therefore be a neutron star. Finally, we were able to classify the source as an atoll source exhibiting the full complement of spectral/timing states of this class (island and banana). From the peak burst flux, an upper limit on the persistent luminosity can be derived of 0.5% of the Eddington luminosity, making 2S 0918-549 one of the least luminous LMXBs showing a kHz QPO. We compare the fractional rms amplitudes of the upper kHz QPO across the ensemble of LMXBs. We find a strong anticorrelation with luminosity. In LMXBs with luminosities ~100 times lower than those of Z sources, the fractional rms amplitude is a factor ~10 larger.
Belloni Tomaso
Ford Eric C.
Homan Jeroen
Jonker Peter G.
Kouveliotou Chryssa
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