Spectral properties of the neutron star low-mass X-ray binaries 4U 1636–53, XTE J1739–285, and MAXI J1816–195

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Table 7.

Details of the NS LMXB samples collected from the literature for Figure 7.

Number	Source	Telescope	kTe (keV)	E_cut (keV)	Flux ^(a)	D (kpc)	References
1	GX 3+1	NuSTAR	2.45 ± 0.04	–	79.66 ± 13.48	6.5	(1)
2	4U 1702–429	NuSTAR	–	$53_{- 2}^{+ 11}$ $53_{-2}^{+11}$	8.56 ± 2.07	5.65	(1)
3	4U 0614+091	NuSTAR	–	$16_{- 4}^{+ 1}$ $16_{-4}^{+1}$	68.75 ± 14.06	3.2	(1)
4	4U 1746–371	NuSTAR	2.91 ± 0.04	–	3.67 ± 0.54	11.9	(1)
5	4U 1636–53	NuSTAR	–	135.9 ± 0.7	20.86 ± 0.18	6	(2)
6	XTE J1710–281	Suzaku	$4 . 45_{- 0.55}^{+ 0.69}$ $4.45_{-0.55}^{+0.69}$	–	1.86 ± 0.06	15	(3)
7	4U 1728–34	Suzaku	–	16.6 ± 1.2	$73 . 6_{- 3.0}^{+ 1.5}$ $73.6_{-3.0}^{+1.5}$	5 ^( * )	(4)
8	4U 1728–34	XMM-Newton/RXTE	–	$19 . 95_{- 2.00}^{+ 7.03}$ $19.95_{-2.00}^{+7.03}$	$222_{- 19}^{+ 66}$ $222_{-19}^{+66}$	5 ^( * )	(4)

Notes.

^(a)

The flux is in unit of 10⁻¹⁰ erg/s/cm². We used the total unabsorbed flux when the power-law flux was not available in the literature. The flux collected from the literature was scaled to the one in a unit energy range 0.1–100 keV for the following compactness calculation.

^( * )The distance was taken from Vincentelli et al. (2023), which is an approximation of the result by Galloway et al. (2003). References: (1) Ludlam et al. (2019); (2) Wang et al. (2017); (3) Sharma et al. (2020); (4) Lyu et al. (2019).

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