THE MASS AND RADIUS OF THE NEUTRON STAR IN 4U 1820-30

被引：249
|
作者：
Guver, Tolga [1 ]
Wroblewski, Patricia [1 ]
Camarota, Larry [1 ]
Ozel, Feryal [1 ]
机构：
[1] Univ Arizona, Dept Astron, Tucson, AZ 85721 USA
来源：
ASTROPHYSICAL JOURNAL | 2010年 / 719卷 / 02期
关键词：
stars: neutron; stars: individual (4U 1820-30); X-rays: binaries; X-RAY-BURSTS; QUASI-PERIODIC OSCILLATIONS; GLOBULAR-CLUSTERS; INTERSTELLAR-MEDIUM; NGC; 6624; COMPTONIZED SPECTRA; MODEL ATMOSPHERES; SPECTROSCOPY; 4U-1820-30; ABSORPTION;
D O I：
10.1088/0004-637X/719/2/1807
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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(circle dot) and the radius to be R = 9.1 +/- 0.4 km.
引用
收藏
页码：1807 / 1812
页数：6
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