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

Tolga Güver; Feryal Özel

doi:10.1088/2041-8205/765/1/L1

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

Tolga Güver, Feryal Özel

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78 Scopus citations

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_⊙ or R = 10.93 ± 2.09 km and M = 1.33 ± 0.33 M_⊙.

Original language	English (US)
Article number	L1
Journal	Astrophysical Journal Letters
Volume	765
Issue number	1
DOIs	https://doi.org/10.1088/2041-8205/765/1/L1
State	Published - Mar 1 2013

Keywords

X-rays: binaries
X-rays: individual (SAX J1748-2021)
stars: neutron

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1088/2041-8205/765/1/L1

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title = "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 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⊙ or R = 10.93 ± 2.09 km and M = 1.33 ± 0.33 M⊙.",

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AU - Özel, Feryal

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N2 - 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⊙ or R = 10.93 ± 2.09 km and M = 1.33 ± 0.33 M⊙.

AB - 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⊙ or R = 10.93 ± 2.09 km and M = 1.33 ± 0.33 M⊙.

KW - X-rays: binaries

KW - X-rays: individual (SAX J1748-2021)

KW - stars: neutron

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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

Abstract

Keywords

ASJC Scopus subject areas

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