Journal
ASTRONOMY & ASTROPHYSICS
Volume 434, Issue 3, Pages L9-L12Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:200500103
Keywords
accretion, accretion disks; binaries : close; stars : individual : XTE J0929-314; XTE J1807-294; stars : neutron
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We report on XMM-Newton observations of two X-ray transient millisecond pulsars (XRTMSPs). We detected XTE J0929-314 with an unabsorbed luminosity of similar to 7 x 10(31) erg s(-1) (0.5-10 keV) at a fiducial distance of 10 kpc. The quiescent spectrum is consistent with a simple power law spectrum. The upper limit on the flux from a cooling neutron star atmosphere is about 20% of the total flux. XTE J1807-294 instead was not detected. We can put an upper limit on the source quiescent 0.5-10 keV unabsorbed luminosity less than or similar to 4 x 10(31) erg s(-1) at 8 kpc. These observations strenghten the idea that XRTMSPs have quiescent luminosities significantly lower than classical neutron star transients.
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