A peculiar thermonuclear X-ray burst from the transiently accreting neutron star SAX J1810.8-2609
arXiv:1210.6981 · doi:10.1017/S174392131202340X
Abstract
We report on a thermonuclear (type-I) X-ray burst that was detected from the neutron star low-mass X-ray binary SAX J1810.8-2609 in 2007 with Swift. This event was longer (~20 min) and more energetic (a radiated energy of Eb~6.5E39 erg) than other X-ray bursts observed from this source. A possible explanation for the peculiar properties is that the X-ray burst occurred during the early stage of the outburst when the neutron star was relatively cold, which allows for the accumulation of a thicker layer of fuel. We also report on a new accretion outburst of SAX J1810.8-2609 that was observed with MAXI and Swift in 2012. The outburst had a duration of ~17 days and reached a 2-10 keV peak luminosity of Lx~3E37(D/5.7kpc)^2 erg/s. This is a factor >10 more luminous than the two previous outbursts observed from the source, and classifies it as a bright rather than a faint X-ray transient.
Proceedings of IAUS 291 "Neutron Stars and Pulsars: Challenges and Opportunities after 80 years", J. van Leeuwen (ed.); 4 pages, 1 figure, 2 tables, contributed talk
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