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AN ULTRA-LOW-MASS AND SMALL-RADIUS COMPACT OBJECT IN 4U 1746-37?
Li, ZS; Qu, ZJ; Chen, L; Guo, YJ; Qu, JL; Xu, RX; Qu JL(屈进禄)
2015
发表期刊ASTROPHYSICAL JOURNAL
卷号798期号:1页码:56
摘要Photospheric radius expansion (PRE) bursts have already been used to constrain the masses and radii of neutron stars. RXTE observed three PRE bursts in 4U 1746-37, all with low touchdown fluxes. We discuss here the possibility of a low-mass neutron star in 4U 1746-37 because the Eddington luminosity depends on stellar mass. With typical values of hydrogen mass fraction and color correction factor, a Monte Carlo simulation was applied to constrain the mass and radius of a neutron star in 4U 1746-37. 4U 1746-37 has a high inclination angle. Two geometric effects, the reflection of the far-side accretion disk and the obscuration of the near-side accretion disk, have also been included in the mass and radius constraints of 4U 1746-37. If the reflection of the far-side accretion disk is accounted for, a low-mass compact object (mass of 0.41 +/- 0.14 M-circle dot and radius of 8.73 +/- 1.54 km at 68% confidence) exists in 4U 1746-37. If another effect operated, 4U 1746-37 may contain an ultra-low-mass and small-radius object (M = 0.21 +/- 0.06 M-circle dot, R = 6.26 +/- 0.99 km at 68% confidence). Combining all possibilities, the mass of 4U 1746-37 is 0.41(-0.30)(+0.70) M-circle dot at 99.7% confidence. For such low-mass neutron stars, it could be reproduced by a self-bound compact star, i.e., a quark star or quark-cluster star.
文章类型Article
关键词binaries: general stars: individual (4U 1746-37) stars: neutron X-rays: binaries X-rays: individual (4U 1746-37) X-rays: stars
学科领域Astronomy & Astrophysics
DOI10.1088/0004-637X/798/1/56
收录类别SCI
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000347245100053
引用统计
被引频次:13[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/228199
专题粒子天体物理中心
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Li, ZS,Qu, ZJ,Chen, L,et al. AN ULTRA-LOW-MASS AND SMALL-RADIUS COMPACT OBJECT IN 4U 1746-37?[J]. ASTROPHYSICAL JOURNAL,2015,798(1):56.
APA Li, ZS.,Qu, ZJ.,Chen, L.,Guo, YJ.,Qu, JL.,...&屈进禄.(2015).AN ULTRA-LOW-MASS AND SMALL-RADIUS COMPACT OBJECT IN 4U 1746-37?.ASTROPHYSICAL JOURNAL,798(1),56.
MLA Li, ZS,et al."AN ULTRA-LOW-MASS AND SMALL-RADIUS COMPACT OBJECT IN 4U 1746-37?".ASTROPHYSICAL JOURNAL 798.1(2015):56.
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