EWOCS-IV: 1Ms ACIS Chandra observation of the supergiant B[e] star Wd1-9

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Volume 701 (September 2025)

A&A, 701 (2025) A138

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Table 1

X-ray spectral fitting results for the combined spectrum.

Model	$N_{H}^{l o c a l}$ $N\rm{_{H}^{local}}$	kT	norm	τ	$χ_{ν}^{2}$ $\chi^2_{\nu}$ (χ²/d.o.f.)	$F_{X} [F_{X}^{I S M c o r}]$ $$F_X$[$F\mathrm{_X^{ISMcor}}$]$	$L_{X} [L_{X}^{I S M c o r}]$ $$L_X$[$L\mathrm{_X^{ISMcor}}$]$
	(10²² cm⁻²)	keV	cm⁻⁵	(10¹⁰ s cm⁻³		(10⁻¹³ erg cm⁻² s⁻¹)	(10³²erg s⁻¹)
A^a	${1.46}_{- 0.18}^{+ 0.23}$ $1.46$_{-0.18}^{+0.23}$$	0.67±0.09	$({0.81}_{- 0.19}^{+ 0.37}) e - 3$ $(0.81$_{-0.19}^{+0.37}$)e$-$3$		1.08 (273.22/253)	${1.45}_{- 0.05}^{+ 0.01} [2.8]$ $1.45$_{-0.05}^{+0.01}$[2.8]$	${3.11}_{- 0.11}^{+ 0.02} [5.99]$ $3.11$_{-0.11}^{+0.02}$[5.99]$
		${2.97}_{- 0.35}^{+ 0.51}$ $2.97$_{-0.35}^{+0.51}$$	$({1.75}_{- 0.32}^{+ 0.35}) e - 4$ $(1.75$_{-0.32}^{+0.35}$)e$-$4$
B^b	${4.26}_{- 0.27}^{+ 0.31}$ $4.26$_{-0.27}^{+0.31}$$	${0.85}_{- 0.16}^{+ 0.19}$ $0.85$_{-0.16}^{+0.19}$$	$({1.07}_{- 0.21}^{+ 0.44}) e - 3$ $(1.07$_{-0.21}^{+0.44}$)e$-$3$	${17.82}_{- 4.79}^{+ 7.96}$ $17.82$_{-4.79}^{+7.96}$$	1.0 (251.78/253)	${1.45}_{- 0.22}^{+ 0.04} [2.06]$ $1.45$_{-0.22}^{+0.04}$[2.06]$	${3.11}_{- 0.48}^{+ 0.09} [4.41]$ $3.11$_{-0.48}^{+0.09}$[4.41]$
		${3.19}_{- 0.74}^{+ 3.01}$ $3.19$_{-0.74}^{+3.01}$$	$({1.71}_{- 0.96}^{+ 1.0}) e - 4$ $(1.71$_{-0.96}^{+1.0}$)e$-$4$

Notes. Model A corresponds to tbabs× phabs× Σvapec, and Model B corresponds to tbabs × phabs× Σvpshock. The plasma temperature is expressed in kilo-electronvolts, with a normalisation parameter defined as $\frac{10^{- 14}}{4 π D^{2}} \int n_{e} n_{H}, d V$ $\frac{10^{-14}}{4\pi D^2}\int n_e n_H , dV$ , where n_e and n_H denote the electron and hydrogen densities, integrated across the emitting volume, V. Here, D represents the distance to the source in centimetres (Smith et al. 2001). τ is the upper limit on the ionisation timescale. We show the absorbed 0.5–8 keV flux, the corresponding luminosity, and in brackets the ISM-corrected values. All uncertainties are quoted at the 1σ confidence level. Abundances of specific elements that were varied are as follows: ^(a)S=2.03±0.30, Ar=2.68±0.9^(b)Fe=3.52 $_{- 0.96}^{+ 1.25}$ $_{-0.96}^{+1.25}$ .

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