Table 1
Hβ values predicted by infrared hydrogen line and consequent values of Cir.
| Nebula | Nebula | Vel. | Diam. | I(7.46)♯ | I(12.37)♯ | T e | –log Hβ♯ | –log Hβ♯ | Predicted | Measured | |
| PNG | name | km s-1 | ′′ | (×10-14) | (×10-14) | K | H(6-5) | H(7-6) | –log Hβ†,♯ | –log Hβ | C ir |
|
|
|||||||||||
| 000.0-6.8 | H1-62 | –84 | 1.5 | 18.8 | 13.1 | 6000 | 11.31 | 11.00 | 11.05 | 11.99 | 0.94 |
| 000.7+3.2 | He2-250 | –175 | 5.0 | 15.0 | 5.80 | 8500 | 11.35 | 11.29 | 11.21 | 13.42 | 2.21 |
| 000.7+4.7 | H2-11 | +40 | 2.0 | 38.9 | 16.4 | 8000 | 10.89 | 10.80 | 10.82 | 13.94 | 3.12 |
| 001.2+2.1 | He2-262 | –172 | 2.32 | 25.7 | 14.4 | 9300 | 11.10 | 10.88 | 10.91 | 13.73 | 2.78 |
| 001.4+5.3 | H1-15 | +42 | 4.4 | 20.0 | 7.17 | 8500 | 11.20 | 11.19 | 11.19 | 12.70 | 1.51 |
| 001.7-4.6 | H1-56 | –134 | 2.5 | 22: | 8.8: | 8500 | 11.19 | 11.11 | 11.16 | 12.14 | 0.98 |
| 002.4-3.7 | M1-38 | –83 | 3.5 | 46: | 16.5 | 7000 | 10.87 | 10.85 | 10.86 | 11.98 | 1.12 |
| 002.6-3.4 | M1-37 | +202 | 4.33 | 17 | 6000 | 10.85 | 10.85 | 12.07 | 1.22 | ||
| 002.8+1.7 | H2-20 | +164 | 3.89 | 31.2 | 11.2 | 7000 | 11.02 | 10.96 | 10.99 | 13.48 | 2.49 |
| 004.9-4.9 | M1-44 | –107 | 5.7 | 17.7 | 6400 | 10.86 | 10.86 | 12.03 | 1.17 | ||
| 006.0-3.6 | M2-31 | +136 | 5.1 | 64.0 | 18.5 | 9600 | 10.67 | 10.75 | 10.73 | 12.19 | 1.46 |
| 008.2+6.8 | He2-260 | +22 | 1.93 | 23.1 | 8.45 | 11 000 | 11.10 | 11.05 | 11.07 | 12.13 | 1.06 |
| 351.2+5.2 | M2-5 | –128 | 5.0 | 28.0 | 8.1 | 6000 | 11.02 | 11.19 | 11.10 | 12.10 | 1.00 |
| 354.2+4.3 | M2-10 | –75 | 4.0 | 19.7 | 7.85 | 6750 | 11.26 | 11.13 | 11.19 | 12.62 | 1.53 |
| 356.5-2.3 | M1-27 | –16.5 | 6.6 | 151 | 56.0 | 6700 | 10.40 | 10.43 | 10.42 | 12.23 | 1.81 |
| 357.1-4.7 | H1-43 | +76 | 3.0 | 15.5: | 10.1 | 6000 | 11.39: | 11.11 | 11.16 | 12.52 | 1.36 |
| 358.9+3.2 | H1-20 | +190 | 4.0 | 41.8 | 13.0 | 8500 | 10.90 | 10.93 | 10.91 | 13.03 | 2.12 |
| 358.9-3.7 | H1-44 | +80 | 3.6 | 6.60 | 6000 | 11.29 | 11.29 | 13.24 | 1.95 | ||
| 359.3-1.8 | M3-44 | –89 | 4.0 | 51 | 17 | 6000 | 10.88 | 10.52 | 10.55 | 13.92 | 3.37 |
Notes.
The Hβ flux is found from the infrared hydrogen lines using the theoretical ratios of Hummer & Storey (1987). It must be remembered that the 12.37 μm line is a blend of the H(7-6) transition with the H(11-8) line, while the 7.46 μm line is a blend of H(6-5) with H(8-6) and H(17-8). These blends are subtracted when deriving Hβ. Furthermore the ratios of the various hydrogen lines are (weakly) dependent on the electron temperature.
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