XMM-Newton Proposal 03053023

Physics

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White Dwarf Binaries, Neutron Star Binaries, Cataclysmic Variables, Ulxs, Black Holes, 4U 1254-690, 4U 1636-536, 4U 1735-444, 4U 1820-303, Ser X-1, Exo 0748-676, 4U 1608-522, Gs 1826-24, 4U 1915-05, 4U 0513-40, 1E 1724-307, 4U 1812-12, 2S 0918-549, 4U 1708-40, 4U 1850-087, 4U 0614+091, Xmm-Newton Proposal 03053023

Scientific paper

Superbursts are thermonuclear X-ray flashes on neutron stars that last up to 14 hr. We propose to carry out 2 quick 25 ks XMM-Newton triggered observations on superbursts from any of 23 (candidate) superbursters that persistently radiate at 30% of Eddington or slower, to carry out high-resolution X-ray spectroscopy of the neutron star surface and constrain the mass-radius relation and equation of state of neutron stars. We will make use of superburst alerts from INTEGRAL/IBIS and Swift/BAT. The potential of this program is at least as good as that of the program on EXO 0748-676, but at much reduced exposure requirements (50 ks in total).

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