Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...206.1706g&link_type=abstract
American Astronomical Society Meeting 206, #17.06; Bulletin of the American Astronomical Society, Vol. 37, p.460
Astronomy and Astrophysics
Astrophysics
Scientific paper
Accreting millisecond X-ray pulsars are the long-sought evolutionary progenitors of ``recycled" millisecond radio pulsars. The population of these sources has grown rapidly over the last three years, with the discovery of five new examples. The latest, IGR J00291+5934, was first detected in outburst by ESA's International Gamma-Ray Astrophysics Laboratory (INTEGRAL) in December 2004, and was subsequently observed by the Rossi X-ray Timing Explorer (RXTE). The neutron star in this 2.46 hr binary has the most rapid spin of the accretion-powered pulsars at 599 Hz. Two previous outbursts were detected retroactively in the RXTE All-Sky Monitor lightcurve, each three years before the next. IGR J00291+5394 is similar in almost every respect to the first accreting millisecond pulsar discovered, SAX J1808.4-3658. I will compare the properties of these two sources to the rest of the sample, and also present recent evidence for variations in the long-term accretion rate.
This work was supported in part by the NASA Long Term Space Astrophysics program under grant NAG 5-9184.
Chakrabarty Deepto
Galloway Duncan K.
Markwardt Craig B.
Morgan Edward Harrington
Strohmayer Tod E.
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