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Observations of the 599 Hz Accreting X‐Ray Pulsar IGR J00291+5934 during the 2004 Outburst and in Quiescence

Observations of the 599 Hz Accreting X‐Ray Pulsar IGR J00291+5934 during the 2004 Outburst and in Quiescence

We report on optical and near-infrared observations obtained during and after the 2004 December discovery outburst of the X-ray transient and accretion-powered millisecond pulsar IGR J00291+5934. Our observations monitored the evolution of the brightness and the spectral properties of IGR J00291+5934 during the outburst decay toward quiescence. We also present …