Ups and downs in the X-ray emission of the colliding wind binaries HD 168112 and HD 167971

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Volume 687 (July 2024)

A&A, 687 (2024) A197

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Table 3

Fits of the X-ray spectra of HD 167971 using 3-T plasma models.

Obs.	Instruments	N_H (10²² cm⁻²)	kT₁ (keV)	norm₁ (cm⁻⁵)	kT₂ (keV)	norm₂ (cm⁻⁵)	kT₃ (keV)	norm₃ (cm⁻⁵)	$χ_{v}^{2}$ $\chi _v^2$	d.o.f.	fx (0.5–10 ke V) (10⁻¹³erg cm⁻² s⁻¹)
1	MOS1+2	${0.72}_{- 0.12}^{+ 0.11}$ $0.72_{ - 0.12}^{ + 0.11}$	${0.31}_{- .03}^{+ .07}$ $0.31_{ - .03}^{ + .07}$	$({11.9}_{- 6.0}^{+ 7.9}) \times 10^{- 3}$ $\left( {11.9_{ - 6.0}^{ + 7.9}} \right) \times {10^{ - 3}}$	${0.86}_{- .15}^{+ .12}$ $0.86_{ - .15}^{ + .12}$	$({12.8}_{- 5.5}^{+ 7.7}) \times 10^{- 4}$ $\left( {12.8_{ - 5.5}^{ + 7.7}} \right) \times {10^{ - 4}}$	${3.0}_{- 0.9}^{+ 2.6}$ $3.0_{ - 0.9}^{ + 2.6}$	$({6.5}_{- 2.6}^{+ 3.1}) \times 10^{- 4}$ $\left( {6.5_{ - 2.6}^{ + 3.1}} \right) \times {10^{ - 4}}$	0.85	111	16.6 ± 1.1
2	EPIC	${0.64}_{- 0.07}^{+ 0.06}$ $0.64_{ - 0.07}^{ + 0.06}$	${0.30}_{- .02}^{+ .03}$ ${0.30_{ - .02}^{ + .03}}$	$({8.6}_{- 2.6}^{+ 3.3}) \times 10^{- 3}$ $\left( {8.6_{ - 2.6}^{ + 3.3}} \right) \times {10^{ - 3}}$	${0.98}_{- .07}^{+ .07}$ $0.98_{ - .07}^{ + .07}$	$({12.9}_{- 2.6}^{+ 2.6}) \times 10^{- 4}$ $\left( {12.9_{ - 2.6}^{ + 2.6}} \right) \times {10^{ - 4}}$	${3.1}_{- 0.8}^{+ 2.8}$ $3.1_{ - 0.8}^{ + 2.8}$	$({4.4}_{- 1.8}^{+ 2.1}) \times 10^{- 4}$ $\left( {4.4_{ - 1.8}^{ + 2.1}} \right) \times {10^{ - 4}}$	1.11	231	14.1 ± 0.7
3	EPIC+RGS	${0.60}_{- 0.04}^{+ 0.04}$ $0.60_{ - 0.04}^{ + 0.04}$	${0.30}_{- .01}^{+ .02}$ $0.30_{ - .01}^{ + .02}$	$({6.3}_{- 1.4}^{+ 1.6}) \times 10^{- 3}$ $\left( {6.3_{ - 1.4}^{ + 1.6}} \right) \times {10^{ - 3}}$	${0.81}_{- .03}^{+ .04}$ $0.81_{ - .03}^{ + .04}$	$({16.9}_{- 2.2}^{+ 2.3}) \times 10^{- 4}$ $\left( {16.9_{ - 2.2}^{ + 2.3}} \right) \times {10^{ - 4}}$	${2.0}_{- 0.1}^{+ 0.2}$ $2.0_{ - 0.1}^{ + 0.2}$	$({8.4}_{- 1.1}^{+ 1.0}) \times 10^{- 4}$ $\left( {8.4_{ - 1.1}^{ + 1.0}} \right) \times {10^{ - 4}}$	1.13	967	15.8 ± 0.4
4	EPIC	${0.53}_{- 0.09}^{+ 0.09}$ $0.53_{ - 0.09}^{ + 0.09}$	${0.31}_{- .03}^{+ .08}$ $0.31_{ - .03}^{ + .08}$	$({6.6}_{- 3.3}^{+ 4.4}) \times 10^{- 3}$ $\left( {6.6_{ - 3.3}^{ + 4.4}} \right) \times {10^{ - 3}}$	${0.84}_{- .08}^{+ .12}$ $0.84_{ - .08}^{ + .12}$	$({16.6}_{- 2.9}^{+ 6.0}) \times 10^{- 4}$ $\left( {16.6_{ - 2.9}^{ + 6.0}} \right) \times {10^{ - 4}}$	${1.9}_{- 0.3}^{+ 0.5}$ $1.9_{ - 0.3}^{ + 0.5}$	$({10.8}_{- 2.7}^{+ 2.6}) \times 10^{- 4}$ $\left( {10.8_{ - 2.7}^{ + 2.6}} \right) \times {10^{ - 4}}$	1.09	180	19.1 ± 0.9
5	EPIC	${0.40}_{- 0.15}^{+ 0.09}$ $0.40_{ - 0.15}^{ + 0.09}$	${0.15}_{- .06}^{+ .22}$ $0.15_{ - .06}^{ + .22}$	$({10.2}_{- 7.4}^{+ 63.6}) \times 10^{- 3}$ $\left( {10.2_{ - 7.4}^{ + 63.6}} \right) \times {10^{ - 3}}$	${0.65}_{- .05}^{+ .33}$ $0.65_{ - .05}^{ + .33}$	$({21.0}_{- 7.7}^{+ 6.1}) \times 10^{- 4}$ $\left( {21.0_{ - 7.7}^{ + 6.1}} \right) \times {10^{ - 4}}$	${1.3}_{- 0.1}^{+ 0.1}$ $1.3_{ - 0.1}^{ + 0.1}$	$({19.3}_{- 4.6}^{+ 2.4}) \times 10^{- 4}$ $\left( {19.3_{ - 4.6}^{ + 2.4}} \right) \times {10^{ - 4}}$	1.22	186	20.0 ± 0.9
6	EPIC	${0.47}_{- 0.17}^{+ 0.16}$ $0.47_{ - 0.17}^{ + 0.16}$	${0.34}_{- .07}^{+ .21}$ $0.34_{ - .07}^{ + .21}$	$({3.9}_{- 2.9}^{+ 7.5}) \times 10^{- 3}$ $\left( {3.9_{ - 2.9}^{ + 7.5}} \right) \times {10^{ - 3}}$	${0.79}_{- 0.09}^{+ 0.13}$ ${0.79_{ - 0.09}^{ + 0.13}}$	$({16.3}_{- 6.4}^{+ 7.2}) \times 10^{- 4}$ $\left( {16.3_{ - 6.4}^{ + 7.2}} \right) \times {10^{ - 4}}$	${1.9}_{- 0.3}^{+ 0.5}$ $1.9_{ - 0.3}^{ + 0.5}$	$({12.5}_{- 3.1}^{+ 3.3}) \times 10^{- 4}$ $\left( {12.5_{ - 3.1}^{ + 3.3}} \right) \times {10^{ - 4}}$	1.15	143	19 1 ± 0.9

Notes. Same as Table 2, but the ISM column was here fixed to 5.15 × 10²¹ cm⁻². For observation 5, a few deviating energy bins of the EPIC-pn spectrum below 0.4 keV were excluded from the fitting procedure.

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