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Optical and X-ray observations of IGR J00291+5934 in quiescence
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Jonker, P. G., Torres, M. A. P. and Steeghs, D. (2008) Optical and X-ray observations of IGR J00291+5934 in quiescence. Astrophysical Journal, Vol.680 (No.1). pp. 615-619. doi:10.1086/587617 ISSN 0004-637X.
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Official URL: http://dx.doi.org/10.1086/587617
Abstract
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 x 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.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QB Astronomy | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | Astrophysical Journal | ||||
| Publisher: | IOP Publishing | ||||
| ISSN: | 0004-637X | ||||
| Official Date: | 10 June 2008 | ||||
| Dates: |
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| Volume: | Vol.680 | ||||
| Number: | No.1 | ||||
| Number of Pages: | 5 | ||||
| Page Range: | pp. 615-619 | ||||
| DOI: | 10.1086/587617 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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