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Home All issues Volume 687 (July 2024) A&A, 687 (2024) A197 Full HTML
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Table 2

Fits of the X-ray spectra of HD 168112 using 3-T plasma models.

Obs. Instruments NH (1022 cm−2) kT1 (keV) norm1 (cm−5) kT2 (keV) norm2 (cm−5) kT3 (keV) norm3 (cm−5) χv2$\chi _v^2$ d.o.f. fx (0.5–10 keV) (10−14 erg cm−2 s−1)
1 MOS1+2 0.54−0.20+0.18$0.54_{ - 0.20}^{ + 0.18}$ 0.20−.15+.13$0.20_{ - .15}^{ + .13}$ (4.4−3.6+157.9)×10−3$\left( {4.4_{ - 3.6}^{ + 157.9}} \right) \times {10^{ - 3}}$ 0.56−.19+.22$0.56_{ - .19}^{ + .22}$ (7.3−6.1+4.0)×10−4$\left( {7.3_{ - 6.1}^{ + 4.0}} \right) \times {10^{ - 4}}$ ≥2.8 (2.3−0.8+1.2)×10−4$\left( {2.3_{ - 0.8}^{ + 1.2}} \right) \times {10^{ - 4}}$ 0.94 66 51.4−5.9+9.4$51.4_{ - 5.9}^{ + 9.4}$
2 MOS1+2 0.26−0.20+0.20$0.26_{ - 0.20}^{ + 0.20}$ 0.14−14+.83$0.14_{ - 14}^{ + .83}$ (2.7−2.6+297.5)×10−3$\left( {2.7_{ - 2.6}^{ + 297.5}} \right) \times {10^{ - 3}}$ 0.60−.12+.08$0.60_{ - .12}^{ + .08}$ (4.5−1.1+2.2)×10−4$\left( {4.5_{ - 1.1}^{ + 2.2}} \right) \times {10^{ - 4}}$ ≥2.5 (1.9−0.7+0.8)×10−4$\left( {1.9_{ - 0.7}^{ + 0.8}} \right) \times {10^{ - 4}}$ 0.76 61 38.7−4.5+2.7$38.7_{ - 4.5}^{ + 2.7}$
3 EPIC 0.59−0.27+0.13$0.59_{ - 0.27}^{ + 0.13}$ 0.26−.03+.05$0.26_{ - .03}^{ + .05}$ (4.4−3.5+4.7)×10−3$\left( {4.4_{ - 3.5}^{ + 4.7}} \right) \times {10^{ - 3}}$ 1.26−.38+.20$1.26_{ - .38}^{ + .20}$ (5.1−2.4+1.3)×10−4$\left( {5.1_{ - 2.4}^{ + 1.3}} \right) \times {10^{ - 4}}$ ≥2.7 (2.5−0.8+2.8)×10−4$\left( {2.5_{ - 0.8}^{ + 2.8}} \right) \times {10^{ - 4}}$ 0.85 162 71.2 ± 4.9
4 EPIC+RGS 0.28−0.20+0.20$0.28_{ - 0.20}^{ + 0.20}$ 0.33−.05+.12$0.33_{ - .05}^{ + .12}$ (9.4−7.0+19.4)×10−4$\left( {9.4_{ - 7.0}^{ + 19.4}} \right) \times {10^{ - 4}}$ 0.94−.08+.09$0.94_{ - .08}^{ + .09}$ (3.9−1.0+1.1)×10−4$\left( {3.9_{ - 1.0}^{ + 1.1}} \right) \times {10^{ - 4}}$ 2.9−0.4+0.5$2.9_{ - 0.4}^{ + 0.5}$ (5.9−0.9+0.8)×10−4$\left( {5.9_{ - 0.9}^{ + 0.8}} \right) \times {10^{ - 4}}$ 0.96 451 84.3 ± 3.7
5 EPIC+RGS 0.33−0.13+0.11$0.33_{ - 0.13}^{ + 0.11}$ 0.31−.03+.09$0.31_{ - .03}^{ + .09}$ (2.0−1.2+1.4)×10−3$\left( {2.0_{ - 1.2}^{ + 1.4}} \right) \times {10^{ - 3}}$ 0.98−07+.07$0.98_{ - 07}^{ + .07}$ (5.8−1.3+1.4)×10−4$\left( {5.8_{ - 1.3}^{ + 1.4}} \right) \times {10^{ - 4}}$ 2.9−0.4+0.6$2.9_{ - 0.4}^{ + 0.6}$ (6.3−1.0+1.2)×10−4$\left( {6.3_{ - 1.0}^{ + 1.2}} \right) \times {10^{ - 4}}$ 1.11 493 103.1 ± 2.3
6 EPIC+RGS 0.52−0.11+0.11$0.52_{ - 0.11}^{ + 0.11}$ 0.30−.06+.08$0.30_{ - .06}^{ + .08}$ (2.2−1.1+2.7)×10−3$\left( {2.2_{ - 1.1}^{ + 2.7}} \right) \times {10^{ - 3}}$ 0.76−0.07+0.16$0.76_{ - 0.07}^{ + 0.16}$ (6.5−2.2+3.0)×10−4$\left( {6.5_{ - 2.2}^{ + 3.0}} \right) \times {10^{ - 4}}$ 3.2−0.6+1.1$3.2_{ - 0.6}^{ + 1.1}$ (4.3−0.9+0.9)×10−4$\left( {4.3_{ - 0.9}^{ + 0.9}} \right) \times {10^{ - 4}}$ 1.03 414 74.0 ± 3.3

Notes. The model was defined according to Eq. (1) with N = 3. The ISM column was fixed to 5.75 × 1021 cm−2. Abundances were fixed to solar following Asplund et al. (2009). The plasma normalisation parameters are equal to 10−144πD2∫​ne nH dV${{{{10}^{ - 14}}} \over {4\pi {D^2}}}\mathop \smallint \nolimits^ {n_{\rm{e}}}\,{n_{\rm{H}}}\,{\rm{d}}V$ in units cm−5 with D the distance of the source and ∫ ne nH dV the emission measure of the plasma. The last column yields the observed flux in the 0.5–10 ke V band. The quoted errors correspond to the 90% confidence intervals. The uncertainties on the observed fluxes were evaluated using the cflux command of the xspec software.

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