The mass and the radius of the neutron star in the transient low mass X-ray binary SAX J1748.9−2021
Güver, Tolga and Özel, Feryal (2013) The mass and the radius of the neutron star in the transient low mass X-ray binary SAX J1748.9−2021. Astrophysical Journal Letters, 765 (1). ISSN 2041-8205 (Print) 2041-8213 (Online)
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Official URL: http://dx.doi.org/10.1088/2041-8205/765/1/L1
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 the Rossi X-ray Timing Explorer 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-circle dot or R = 10.93 +/- 2.09 km and M = 1.33 +/- 0.33 M-circle dot.
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