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American Astronomical Society, Astrophysical Journal Letters, 1(765), p. L1, 2013

DOI: 10.1088/2041-8205/765/1/l1

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

Journal article published in 2013 by Tolga Güver, Feryal Özel, Tolga Guver ORCID, Feryal Ozel
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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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. ; Comment: Accepted for publication in the Astrophysical Journal Letters