The mass and radius of the neutron star in 4U 1820-30

Tolga Güver; Patricia Wroblewski; Larry Camarota; Feryal Özel

doi:10.1088/0004-637X/719/2/1807

The mass and radius of the neutron star in 4U 1820-30

Tolga Güver, Patricia Wroblewski, Larry Camarota, Feryal Özel

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255 Scopus citations

Abstract

We report on the measurement of the mass and radius of the neutron star in the low-mass X-ray binary 4U 1820-30. The analysis of the spectroscopic data on multiple thermonuclear bursts yields well-constrained values for the apparent emitting area and the Eddington flux, both of which depend in a distinct way on the mass and radius of the neutron star. The distance to the source is that of the globular cluster NGC 6624, where the source resides. Combining these measurements, we uniquely determine the probability density over the stellar mass and radius. We find the mass to be M = 1.58 ± 0.06 M _⊙ and the radius to be R = 9.1 ± 0.4 km.

Original language	English (US)
Pages (from-to)	1807-1812
Number of pages	6
Journal	Astrophysical Journal
Volume	719
Issue number	2
DOIs	https://doi.org/10.1088/0004-637X/719/2/1807
State	Published - Aug 20 2010

Keywords

Stars: individual (4U 1820-30)
Stars: neutron
X-rays: binaries

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1088/0004-637X/719/2/1807

Cite this

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title = "The mass and radius of the neutron star in 4U 1820-30",

abstract = "We report on the measurement of the mass and radius of the neutron star in the low-mass X-ray binary 4U 1820-30. The analysis of the spectroscopic data on multiple thermonuclear bursts yields well-constrained values for the apparent emitting area and the Eddington flux, both of which depend in a distinct way on the mass and radius of the neutron star. The distance to the source is that of the globular cluster NGC 6624, where the source resides. Combining these measurements, we uniquely determine the probability density over the stellar mass and radius. We find the mass to be M = 1.58 ± 0.06 M ⊙ and the radius to be R = 9.1 ± 0.4 km.",

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T1 - The mass and radius of the neutron star in 4U 1820-30

AU - Güver, Tolga

AU - Wroblewski, Patricia

AU - Camarota, Larry

AU - Özel, Feryal

PY - 2010/8/20

Y1 - 2010/8/20

N2 - We report on the measurement of the mass and radius of the neutron star in the low-mass X-ray binary 4U 1820-30. The analysis of the spectroscopic data on multiple thermonuclear bursts yields well-constrained values for the apparent emitting area and the Eddington flux, both of which depend in a distinct way on the mass and radius of the neutron star. The distance to the source is that of the globular cluster NGC 6624, where the source resides. Combining these measurements, we uniquely determine the probability density over the stellar mass and radius. We find the mass to be M = 1.58 ± 0.06 M ⊙ and the radius to be R = 9.1 ± 0.4 km.

AB - We report on the measurement of the mass and radius of the neutron star in the low-mass X-ray binary 4U 1820-30. The analysis of the spectroscopic data on multiple thermonuclear bursts yields well-constrained values for the apparent emitting area and the Eddington flux, both of which depend in a distinct way on the mass and radius of the neutron star. The distance to the source is that of the globular cluster NGC 6624, where the source resides. Combining these measurements, we uniquely determine the probability density over the stellar mass and radius. We find the mass to be M = 1.58 ± 0.06 M ⊙ and the radius to be R = 9.1 ± 0.4 km.

KW - Stars: individual (4U 1820-30)

KW - Stars: neutron

KW - X-rays: binaries

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The mass and radius of the neutron star in 4U 1820-30

Abstract

Keywords

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