Table 1
RGS best-fit parameters to the four observations (see also Figs. 1–4).
| Component | Parameter | A.1 | A.2 | A.3 | B | |
|
|
||||||
| Blackbody | R (107 m) | 2.1 ± 0.2 | 1.0 ± 0.1 | 1.76 ± 0.03 | 0.19 ± 0.05 | |
| kTeff (eV) | 91 ± 1 | 81 ± 1 | 121 ± 2 | 95 ± 1 | ||
| LRGS (1032 W) | 2.20 | 0.23 | 5.70 | 0.03 | ||
| LBOL (1032 W) | 4.39 | 0.57 | 8.49 | 0.04 | ||
|
|
||||||
| CIE | ne nH V (1063 m-3) | 5.6 ± 0.7 | 7.1 ± 0.7 | 9.6 ± 0.4 | 5.2 ± 0.4 | |
| kT (keV)a | 0.39 ± 0.05 | 0.39 ± 0.05 | 0.37 ± 0.05 | 0.71 ± 0.05 | ||
| LRGS (1028 W) | 0.79 | 1.05 | 1.40 | 0.94 | ||
| LBOL (1028 W) | 1.24 | 1.65 | 2.24 | 1.45 | ||
| σC (km s-1) | ≡3000 | ≡3000 | 3000 ± 300 | ≡3000 | ||
| Mg/Ne | ≡1.2 | ≡1.2 | 1.2 ± 0.2 | ≡1.2 | ||
| Δχ2/d.o.f. | 85/2 | 136/2 | 709/4 | 255/2 | ||
|
|
||||||
| Abundances in the shell |
C/O | ≡0.13 | ≡0.13 | 0.13 ± 0.01 | ≡0.13 | |
| N/O | ≡2.41 | ≡2.41 | 2.41 ± 0.01 | ≡2.41 | ||
| Si/O | ≡0.015 | ≡0.015 | 0.015 ± 0.005 | ≡0.015 | ||
| S/O | ≡0.11 | ≡0.11 | 0.11 ± 0.01 | ≡0.11 | ||
| Ar/O | ≡0.20 | ≡0.20 | 0.20 ± 0.01 | ≡0.20 | ||
| Ca/Ob | ≡0.01 | ≡0.01 | ≲0.01 | ≡0.01 | ||
| Fe/O | ≡0.47 | ≡0.47 | 0.47 ± 0.01 | ≡0.47 | ||
|
|
||||||
| Layer 1 | H Col. (1028 m-2) | 0.73 ± 0.02 | 2.13 ± 0.01 | 0.48 ± 0.01 | 1.22 ± 0.07 | |
| O Col. (1025 m-2) | 0.44 ± 0.01 | 1.29 ± 0.01 | 0.29 ± 0.01 | 0.74 ± 0.04 | ||
| Log ξ (10-9 Wm) | ≳ 5.0 | 4.25 ± 0.02 | ≳ 4.9 | 4.38 ± 0.06 | ||
| σV (km s-1) | 1230 ± 20 | 225 ± 35 | 1470 ± 10 | 55 ± 20 | ||
| v (km s-1) | −3730 ± 30 | −3360 ± 70 | −3620 ± 20 | −4560 ± 130 | ||
| Δχ2/d.o.f. | 526/4 | 609/4 | 4083/11 | 449/4 | ||
|
|
||||||
| Layer 2 | H Col. (1028 m-2) | 2.0 ± 0.2 | 0.1 ± 0.05 | 4.15 ± 0.02 | 0.013 ± 0.002 | |
| O Col. (1025 m-2) | 1.2 ± 0.1 | 0.06 ± 0.03 | 2.51 ± 0.01 | 0.008 ± 0.001 | ||
| Log ξ (10-9 Wm) | 3.61 ± 0.01 | 2.50 ± 0.05 | 3.76 ± 0.01 | 2.18 ± 0.03 | ||
| σV (km s-1) | 10 ± 5 | 10 ± 5 | 20 ± 5 | 160 ± 10 | ||
| v (km s-1) | −2790 ± 20 | −3260 ± 20 | −2810 ± 10 | −3080 ± 40 | ||
| Δχ2/d.o.f. | 526/4 | 62/4 | 2951/11 | 373/4 | ||
|
|
||||||
| Layer 3 | H Col. (1025 m-2) | 8.1 ± 0.2 | 0.5 ± 0.1 | 8.1 ± 0.2 | 2.6 ± 0.2 | |
| O Col. (1022 m-2) | 4.9 ± 0.1 | 0.30 ± 0.06 | 4.9 ± 0.1 | 1.6 ± 0.1 | ||
| Log ξ (10-9 Wm) | 1.40 ± 0.05 | ≲0.01 | 1.36 ± 0.01 | 1.18 ± 0.05 | ||
| σV (km s-1) | 235 ± 10 | 70 ± 20 | 200 ± 10 | 180 ± 20 | ||
| v (km s-1) | −3400 ± 30 | ≳ −3040 | −3340 ± 20 | −3300 ± 50 | ||
| Δχ2/d.o.f. | 448/4 | 25/4 | 781/11 | 399/4 | ||
|
|
||||||
| Cold gas | Col. (1025 m-2) | 2.85 ± 0.01 | 2.81 ± 0.01 | 2.24 ± 0.01 | 1.97 ± 0.02 | |
| kT (eV) | 1.13 ± 0.01 | 1.21 ± 0.01 | 1.04 ± 0.01 | 0.99 ± 0.02 | ||
| N/H | ≡2.14 | ≡2.14 | 2.14 ± 0.02 | ≡2.14 | ||
| O/H | ≡2.71 | ≡2.71 | 2.71 ± 0.01 | ≡2.71 | ||
| Fe/H | ≡1.19 | ≡1.19 | 1.19 ± 0.03 | ≡1.19 | ||
|
|
||||||
| Dust | O i (1021 m-2) | 3.8 ± 0.1 | 6.3 ± 0.1 | 3.2 ± 0.1 | 5.3 ± 0.2 | |
| Δχ2/d.o.f. | 497/1 | 356/1 | 1300/1 | 948/1 | ||
|
|
||||||
| Statistics | χ2/d.o.f. | 3538/1474 | 3980/1474 | 10380/1462 | 3390/1474 | |
Notes.
The CIE temperature is kept frozen to the value estimated with a local fit to the 7−15 Å spectral range.
All errors are statistical, systematic effects are not considered here (for further information see Sect. 3.1.2).
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