Optical and X-Ray Observations of IGR J00291+5934 in Quiescence

Details Optical and X-Ray Observations of IGR J00291+5934 in Quiescence Optical and X-Ray Observations of IGR J00291+5934 in Quiescence

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...680..615j&link_type=abstract

The Astrophysical Journal, Volume 680, Issue 1, pp. 615-619.

Astronomy and Astrophysics

Astronomy

13

Accretion, Accretion Disks, Stars: Binaries: Close, Stars: Individual (Igr J00291+5934), Stars: Neutron, X-Rays: Binaries

Scientific paper

We report on optical and X-ray observations of the accretion-powered millisecond pulsar IGR J00291+5934 in quiescence. Time-resolved I-band photometry has been obtained with the 4.2 m William Herschel Telescope, while a 3 ks Chandra observation provided contemporaneous X-ray coverage. We found an unabsorbed 0.5-10 keV X-ray flux of 1×10-13 erg cm-2 s-1, which implies that the source was in quiescence at the time of the optical observations. Nevertheless, the optical I-band light curve of IGR J00291+5934 shows evidence for strong flaring. After removal of the strongest flares, we find evidence for an orbital modulation in the phase-folded I-band light curve. The overall modulation can be described by effects resulting from the presence of a superhump. Comparing our light curve with that reported recently we find evidence for a change in the quiescent base level. Similar changes have now been reported for four soft X-ray transients, implying that they may be a common feature of such systems in quiescence. Furthermore, the maximum in our folded light curve occurs at a different phase than observed before.

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