Table 3: Photoelectric absorption results towards 4U 1850-087 (see Table 2 for the continuum emission parameters). The edge energies were fixed at 0.54, 0.71 and 0.87 keV for O, Fe and Ne, respectively. $\tau _{\rm edge}$ is the absorption depth. $N_{\rm Z}$ is the element column density (in units of 10¹⁷ cm^-2) calculated using the Henke et al. (1993) cross sections. $N_{\rm H}$ is the hydrogen column density implied by $N_{\rm Z}$ , in units of 10²¹ cm^-2, assuming the ISM abundances of Wilms et al. (2000).
Model Edge $\tau _{\rm edge}$ $N_{\rm Z}$ $N_{\rm H}$ Ne/O

Observation 1

dbb+ Ne K $\rm0.19^{+0.04} _{-0.05}$ $\rm 5.2^{+1.1}_{-1.4}$ $\rm 6.0^{+1.3}_{-1.6}$

pow O K $\rm 2.07^{+0.12}_{-0.12}$ $\rm 36.4^{+2.1}_{-2.1}$ $\rm 7.4^{+0.4}_{-0.4}$ $\rm0.14^{+0.03}_{-0.04}$

Fe L $\rm0.54^{+0.06}_{-0.06}$ $\rm0.77^{+0.09}_{-0.09}$ $\rm 2.9^{+0.3}_{-0.3}$

bb+ Ne K $\rm0.20 ^{+0.04} _{-0.04}$ $\rm 5.5^{+1.1}_{-1.1}$ $\rm 6.3^{+1.3}_{-1.3}$

pow O K $\rm 2.17 ^{+0.12} _{-0.12}$ $\rm 38.2^{+2.1}_{-2.1}$ $\rm 7.8^{+0.4}_{-0.4}$ $\rm0.14^{+0.03}_{-0.03}$

Fe L $\rm0.57 ^{+0.06} _{-0.06}$ $\rm0.81^{+0.09}_{-0.09}$ $\rm 3.0^{+0.3}_{-0.3}$

dbb+ Ne K $\rm0.18 ^{+0.04} _{-0.05}$ $\rm 5.0^{+1.1}_{-1.1}$ $\rm 5.7^{+1.3}_{-1.6}$

+ctt O K $\rm 1.76 ^{+0.14} _{-0.13}$ $\rm 31.0^{+2.5}_{-2.5}$ $\rm 6.3^{+0.5}_{-0.5}$ $\rm0.16^{+0.04}_{-0.05}$

Fe L $\rm0.46 ^{+0.07} _{-0.06}$ $\rm0.66^{+0.10}_{-0.10}$ $\rm 2.4^{+0.4}_{-0.3}$

Observation 2

dbb+ Ne K $\rm0.27 ^{+0.05}_{-0.05}$ $\rm 7.4^{+1.4}_{-1.4}$ $\rm 8.5^{+1.6}_{-1.6}$

pow O K $\rm 2.32 ^{+0.13}_{-0.13}$ $\rm 40.8^{+2.3}_{-2.3}$ $\rm 8.3^{+0.5}_{-0.5}$ $\rm0.18^{+0.04}_{-0.04}$

Fe L $\rm0.70 ^{+0.07}_{-0.07}$ $\rm 1.0^{+0.1} _{-0.1}$ $\rm 3.7^{+0.4}_{-0.4}$

bb+ Ne K $\rm0.29 ^{+0.05}_{-0.05}$ $\rm 8.0^{+1.4}_{-1.4}$ $\rm 9.2^{+1.6}_{-1.6}$

pow O K $\rm 2.41 ^{+0.12}_{-0.12}$ $\rm 42.4^{+2.1}_{-2.1}$ $\rm 8.7^{+0.4}_{-0.4}$ $\rm0.19^{+0.03}_{-0.03}$

Fe L $\rm0.73 ^{+0.07}_{-0.07}$ $\rm 1.0^{+0.1} _{-0.1}$ $\rm 3.9^{+0.4}_{-0.4}$

dbb+ Ne K $\rm0.25 ^{+0.04} _{-0.08}$ $\rm 6.9^{+1.1}_{-2.2}$ $\rm 7.9^{+1.3}_{-2.5}$

ctt O K $\rm 1.90 ^{+0.14} _{-0.22}$ $\rm 33.5^{+2.5}_{-3.9}$ $\rm 6.9^{+0.5}_{-0.8}$ $\rm0.21^{+0.04}_{-0.07}$

Fe L $\rm0.60 ^{+0.07} _{-0.11}$ $\rm0.86^{+0.10}_{-0.16}$ $\rm 3.2^{+0.4}_{-0.4}$

**Table 3:** Photoelectric absorption results towards 4U 1850-087 (see Table 2 for the continuum emission parameters). The edge energies were fixed at 0.54, 0.71 and 0.87 keV for O, Fe and Ne, respectively. $\tau _{\rm edge}$ is the absorption depth. $N_{\rm Z}$ is the element column density (in units of 10¹⁷ cm^-2) calculated using the Henke et al. (1993) cross sections. $N_{\rm H}$ is the hydrogen column density implied by $N_{\rm Z}$ , in units of 10²¹ cm^-2, assuming the ISM abundances of Wilms et al. (2000).
Model	Edge	$\tau _{\rm edge}$	$N_{\rm Z}$	$N_{\rm H}$	Ne/O
Observation 1
dbb+	Ne K	$\rm0.19^{+0.04} _{-0.05}$	$\rm 5.2^{+1.1}_{-1.4}$	$\rm 6.0^{+1.3}_{-1.6}$
pow	O K	$\rm 2.07^{+0.12}_{-0.12}$	$\rm 36.4^{+2.1}_{-2.1}$	$\rm 7.4^{+0.4}_{-0.4}$	$\rm0.14^{+0.03}_{-0.04}$
	Fe L	$\rm0.54^{+0.06}_{-0.06}$	$\rm0.77^{+0.09}_{-0.09}$	$\rm 2.9^{+0.3}_{-0.3}$
bb+	Ne K	$\rm0.20 ^{+0.04} _{-0.04}$	$\rm 5.5^{+1.1}_{-1.1}$	$\rm 6.3^{+1.3}_{-1.3}$
pow	O K	$\rm 2.17 ^{+0.12} _{-0.12}$	$\rm 38.2^{+2.1}_{-2.1}$	$\rm 7.8^{+0.4}_{-0.4}$	$\rm0.14^{+0.03}_{-0.03}$
	Fe L	$\rm0.57 ^{+0.06} _{-0.06}$	$\rm0.81^{+0.09}_{-0.09}$	$\rm 3.0^{+0.3}_{-0.3}$
dbb+	Ne K	$\rm0.18 ^{+0.04} _{-0.05}$	$\rm 5.0^{+1.1}_{-1.1}$	$\rm 5.7^{+1.3}_{-1.6}$
+ctt	O K	$\rm 1.76 ^{+0.14} _{-0.13}$	$\rm 31.0^{+2.5}_{-2.5}$	$\rm 6.3^{+0.5}_{-0.5}$	$\rm0.16^{+0.04}_{-0.05}$
	Fe L	$\rm0.46 ^{+0.07} _{-0.06}$	$\rm0.66^{+0.10}_{-0.10}$	$\rm 2.4^{+0.4}_{-0.3}$
Observation 2
dbb+	Ne K	$\rm0.27 ^{+0.05}_{-0.05}$	$\rm 7.4^{+1.4}_{-1.4}$	$\rm 8.5^{+1.6}_{-1.6}$
pow	O K	$\rm 2.32 ^{+0.13}_{-0.13}$	$\rm 40.8^{+2.3}_{-2.3}$	$\rm 8.3^{+0.5}_{-0.5}$	$\rm0.18^{+0.04}_{-0.04}$
	Fe L	$\rm0.70 ^{+0.07}_{-0.07}$	$\rm 1.0^{+0.1} _{-0.1}$	$\rm 3.7^{+0.4}_{-0.4}$
bb+	Ne K	$\rm0.29 ^{+0.05}_{-0.05}$	$\rm 8.0^{+1.4}_{-1.4}$	$\rm 9.2^{+1.6}_{-1.6}$
pow	O K	$\rm 2.41 ^{+0.12}_{-0.12}$	$\rm 42.4^{+2.1}_{-2.1}$	$\rm 8.7^{+0.4}_{-0.4}$	$\rm0.19^{+0.03}_{-0.03}$
	Fe L	$\rm0.73 ^{+0.07}_{-0.07}$	$\rm 1.0^{+0.1} _{-0.1}$	$\rm 3.9^{+0.4}_{-0.4}$
dbb+	Ne K	$\rm0.25 ^{+0.04} _{-0.08}$	$\rm 6.9^{+1.1}_{-2.2}$	$\rm 7.9^{+1.3}_{-2.5}$
ctt	O K	$\rm 1.90 ^{+0.14} _{-0.22}$	$\rm 33.5^{+2.5}_{-3.9}$	$\rm 6.9^{+0.5}_{-0.8}$	$\rm0.21^{+0.04}_{-0.07}$
	Fe L	$\rm0.60 ^{+0.07} _{-0.11}$	$\rm0.86^{+0.10}_{-0.16}$	$\rm 3.2^{+0.4}_{-0.4}$

Source LaTeX | All tables | In the text

	1 Introduction
	2 Observations
	3 Results
	4 Discussion
	References