The mass and the radius of the neutron star in the transient low mass X-ray binary SAX J1748.9-2021

Abstract

We use time resolved spectroscopy of thermonuclear X-ray bursts observed from SAX J1748.9-2021 to infer the mass and the radius of the neutron star in the binary. Four X-ray bursts observed from the source with RXTE enable us to measure the angular size and the Eddington limit on the neutron star surface. Combined with a distance measurement to the globular cluster NGC 6440, in which SAX J1748.9-2021 resides, we obtain two solutions for the neutron star radius and mass, R = 8.18 +/- 1.62 km and M = 1.78 +/- 0.3 M_\sun or R = 10.93 +/- 2.09 km and M = 1.33 +/- 0.33 M_\sun.

Accepted for publication in the Astrophysical Journal Letters

References in corpus (7)

• Thermonuclear (type-I) X-ray bursts observed by the Rossi X-ray Timing Explorer
• Astrophysical Measurement of the Equation of State of Neutron Star Matter
• The Mass and Radius of the Neutron Star in 4U 1820-30
• Eight New Millisecond Pulsars in NGC 6440 and NGC 6441
• Near-IR properties of 24 Globular Clusters in the Galactic Bulge
• Constraining the equation of state of supra-nuclear dense matter from XMM-Newton observations of neutron stars in globular clusters
• Probing the Galactic Bulge with deep Adaptive Optics imaging: the age of NGC 6440

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