THE MASS AND THE RADIUS OF THE NEUTRON STAR IN THE TRANSIENT LOW-MASS X-RAY BINARY SAX J1748.9-2021

被引：78

作者：

Guver, Tolga ^{[1
]}

Oezel, Feryal ^{[2
,3
]}

机构：

[1] Sabanci Univ, Fac Engn & Nat Sci, TR-34956 Istanbul, Turkey

[2] Univ Arizona, Dept Astron, Tucson, AZ 85721 USA

[3] Harvard Univ, Radcliffe Inst Adv Study, Cambridge, MA 02138 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2013年 / 765卷 / 01期

基金：

美国国家科学基金会;

关键词：

stars: neutron; X-rays: binaries; X-rays: individual (SAX J1748-2021); EQUATION-OF-STATE; SPECTROSCOPIC MEASUREMENTS; SYSTEMATIC UNCERTAINTIES; TIMING-EXPLORER; NGC; 6440; BURSTS; EXPANSION; NGC-6440; MATTER; BULGE;

D O I：

10.1088/2041-8205/765/1/L1

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

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