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 3.

Best-fitting results for the fits to the X-ray spectra of 4U 1636–53 with the reflection model M1–M4.

Model Comp	Parameter	M1	M2	M3	M4
TBABS	N_H (10²² cm⁻²)	0.82 ± 0.04	0.87 ± 0.03	$0 . 82_{- 0.05}^{+ 0.04}$ $0.82_{-0.05}^{+0.04}$	$0 . 76_{- 0.02}^{+ 0.04}$ $0.76_{-0.02}^{+0.04}$
BBODYRAD	kT_BB (keV)	1.32 ± 0.07	1.50 ± 0.02	$1 . 80_{- 0.05}^{+ 0.04}$ $1.80_{-0.05}^{+0.04}$	$1 . 72_{- 0.06}^{+ 0.05}$ $1.72_{-0.06}^{+0.05}$
	Norm	$12 . 0_{- 3.3}^{+ 3.9}$ $12.0_{-3.3}^{+3.9}$	3.2 ± 0.2	$6 . 0_{- 0.5}^{+ 0.8}$ $6.0_{-0.5}^{+0.8}$	2.8 ± 0.1
	Flux (10⁻¹⁰ c.g.s)	$3 . 92_{- 0.43}^{+ 0.41}$ $3.92_{-0.43}^{+0.41}$	1.73 ± 0.05	$6 . 77_{- 0.07}^{+ 0.11}$ $6.77_{-0.07}^{+0.11}$	$2 . 61_{- 0.29}^{+ 0.34}$ $2.61_{-0.29}^{+0.34}$
DISKBB	kT_disk (keV)	0.160 ± 0.002	0.157 ± 0.002	$0 . 158_{- 0.004}^{+ 0.007}$ $0.158_{-0.004}^{+0.007}$	$0 . 167_{- 0.004}^{+ 0.002}$ $0.167_{-0.004}^{+0.002}$
	Norm	$151579_{- 26033}^{+ 22572}$ $151579_{-26033}^{+22572}$	$223547_{- 34060}^{+ 39985}$ $223547_{-34060}^{+39985}$	$170957_{- 62654}^{+ 59603}$ $170957_{-62654}^{+59603}$	$101370_{- 26358}^{+ 30441}$ $101370_{-26358}^{+30441}$
	Flux (10⁻¹⁰ c.g.s)	$18 . 4_{- 2.5}^{+ 2.8}$ $18.4_{-2.5}^{+2.8}$	$24 . 6_{- 2.4}^{+ 2.5}$ $24.6_{-2.4}^{+2.5}$	$19 . 7_{- 3.7}^{+ 4.0}$ $19.7_{-3.7}^{+4.0}$	$14 . 6_{- 2.7}^{+ 3.0}$ $14.6_{-2.7}^{+3.0}$
THCOMP	Γ	1.68 ± 0.02	1.65 ± 0.01	$1 . 50_{- 0.01}^{+ 0.03}$ $1.50_{-0.01}^{+0.03}$	$1 . 53_{- 0.02}^{+ 0.04}$ $1.53_{-0.02}^{+0.04}$
	kT_e (keV)	$33 . 0_{- 3.7}^{+ 3.3}$ $33.0_{-3.7}^{+3.3}$	$18 . 2_{- 0.7}^{+ 0.8}$ $18.2_{-0.7}^{+0.8}$	$17 . 8_{- 0.6}^{+ 0.8}$ $17.8_{-0.6}^{+0.8}$	$18 . 0_{- 0.7}^{+ 0.8}$ $18.0_{-0.7}^{+0.8}$
	f_cov	$0 . 79_{- 0.06}^{+ 0.05}$ $0.79_{-0.06}^{+0.05}$	0.05 ± 0.01	$0 . 54_{- 0.04}^{+ 0.05}$ $0.54_{-0.04}^{+0.05}$	0.05 ± 0.01
RELXILLCP	Incl	$15 . 0_{- 10.0 }^{+ 9.3}$ $15.0_{-10.0}^{+9.3}$	$5 . 0_{- 0 }^{+ 10.1}$ $5.0_{-0}^{+10.1}$	–	–
	R_in (R_g)	$15 . 7_{- 3.7}^{+ 5.6}$ $15.7_{-3.7}^{+5.6}$	$13 . 1_{- 1.8}^{+ 2.2}$ $13.1_{-1.8}^{+2.2}$	–	–
	log(ξ)	$3 . 94_{- 0.04}^{+ 0.02}$ $3.94_{-0.04}^{+0.02}$	$3 . 90_{- 0.01}^{+ 0.03}$ $3.90_{-0.01}^{+0.03}$	–	–
	Norm (10⁻⁴)	$21 . 7_{- 1.8}^{+ 2.0}$ $21.7_{-1.8}^{+2.0}$	$14 . 1_{- 1.2}^{+ 1.1}$ $14.1_{-1.2}^{+1.1}$	–	–
	Flux (10⁻¹⁰ c.g.s)	25.2 ± 1.7	$16 . 9_{- 1.5}^{+ 1.1}$ $16.9_{-1.5}^{+1.1}$	–	–
RELXILLLPCP	Incl	–	–	$34 . 7_{- 1.5}^{+ 1.6}$ $34.7_{-1.5}^{+1.6}$	$18 . 5_{- 8.0}^{+ 6.7}$ $18.5_{-8.0}^{+6.7}$
	R_in (R_g)	–	–	$6 . 6_{- 0.1}^{+ 3.2}$ $6.6_{-0.1}^{+3.2}$	$17 . 2_{- 3.4}^{+ 4.6}$ $17.2_{-3.4}^{+4.6}$
	h (R_g)	–	–	2.31 ± 0.01	2.51 ± 0.05
	log(ξ)	–	–	$3 . 59_{- 0.02}^{+ 0.01}$ $3.59_{-0.02}^{+0.01}$	3.78 ± 0.04
	Norm (10⁻²)	–	–	$9 . 3_{- 2.5}^{+ 2.8}$ $9.3_{-2.5}^{+2.8}$	$3 . 2_{- 0.5}^{+ 0.6}$ $3.2_{-0.5}^{+0.6}$
	Flux (10⁻¹⁰ c.g.s)	–	–	19.8 ± 0.2	$16 . 4_{- 0.9}^{+ 0.8}$ $16.4_{-0.9}^{+0.8}$
	$χ_{ν}^{2}$ $\chi_{\nu}^{2}$ (χ²/d.o.f.)	1.23(3476.4/2831)	1.24(3505.9/2831)	1.22(3447.6/2830)	1.22(3443.8/2830)
	Total Flux (10⁻¹⁰ c.g.s)	$54 . 4_{- 2.5}^{+ 3.2}$ $54.4_{-2.5}^{+3.2}$	$59 . 6_{- 3.3}^{+ 1.8}$ $59.6_{-3.3}^{+1.8}$	$54 . 6_{- 4.4}^{+ 6.2}$ $54.6_{-4.4}^{+6.2}$	$49 . 0_{- 2.8}^{+ 3.1}$ $49.0_{-2.8}^{+3.1}$

Notes. We list the unabsorbed flux (erg cm⁻² s⁻¹) in the energy range 0.1–100 keV. All errors in the tables are at the 90% confidence level unless otherwise indicated. The asterisk indicates that the error peaked at the hard limit of the parameter range.

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