title   
  

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

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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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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 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.
Item Type: Article
Additional Information: Article Number: L1
Uncontrolled Keywords: stars: neutron; X-rays: binaries; X-rays: individual (SAX J1748-2021)
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Engineering and Natural Sciences > Basic Sciences > Physics
Faculty of Engineering and Natural Sciences
Depositing User: Tolga Güver
Date Deposited: 19 Nov 2014 16:03
Last Modified: 26 Apr 2022 09:16
URI: https://research.sabanciuniv.edu/id/eprint/25207

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