Looking at A 0535+26 at low luminosities with NuSTAR

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Table 3

Best-fit parameters for the compmag model.

	Obs. I	Obs. II	Obs. II
	compmag	compmag	compmag + Gauss

N _H ^a
k T _BB ^b		1.08 ± 0.02
k T _e ^b
τ	0.75 ± 0.04	0.50 ± 0.01
A	0.01	0.01	0.01
r ₀ ^c		>7847
ℱ_compmag ^d	2.96 ± 0.01	1.03 ± 0.01
ℱ_Gauss ^d	–	–
E _Gauss ^b	–	–
σ _Gauss ^b	–	–
E _CRSF ^b	45.5 ± 0.7
σ _CRSF ^b
d _CRSF
E _Fe ^b	6.38 ± 0.05
EQW_Fe ^e	23 ± 4	15 ± 6	17 ± 6
c _FMPA ^f	1	1	1
c _FMPB ^f	1.005 ± 0.003	1.018 ± 0.005	1.018 ± 0.004
c _XRT ^f	1.129 ± 0.016	0.554 ± 0.022	0.545 ± 0.022

(d.o.f.)	1.06 (926)	1.12 (807)	0.96 (804)

Notes.

^(a)

Equivalent hydrogen column density in units of 10²² cm^-2.

^(b)

In keV.

^(c)

In units of m. Converted from units of Schwarzschild radii for a neutron star mass of 1.4 M_⊙.

^(d)

3–50 keV flux in units of 10^-9 erg s^-1 cm^-2.

^(e)

Equivalent width in units of eV.

^(f)

Detector cross-calibration constant with respect to FPMA.

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