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| Query : 2002AJ....124.3336H |
2002AJ....124.3336H - Astron. J., 124, 3336-3339 (2002/December-0)
Measurements of [O I] λ6300/Hα intensity ratios for four O star H II regions.
HAUSEN N.R., REYNOLDS R.J. and HAFFNER L.M.
Abstract (from CDS):
We have used the Wisconsin Hα Mapper facility to measure the [O I] λ6300/Hα line intensity ratios for four O star H II regions: S27 (observation coordinates l=6°.3,b=+23°.6), S252 (l=190°.1,b=+0°.6), S261 (l=194°.1,b=-1°.9), and S264 (l=195°.1,b=-12°.0). We find that the ratios range from 0.0015 to 0.0053. These results are roughly a factor of 10 lower than measured [O I]/Hα ratios in directions that sample the warm ionized component of the interstellar medium. This difference implies a significantly lower hydrogen ionization ratio n(H+)/n(H0) or higher electron temperature in the diffuse ionized gas compared with that in the bright discrete O star H II regions.
Abstract Copyright: ∼
Journal keyword(s): ISM: H II Regions - ISM: Clouds - ISM: General
Simbad objects: 12
| Number of rows : 12 |
| N | Identifier | Otype |
ICRS (J2000) RA |
ICRS (J2000) DEC |
Mag U | Mag B | Mag V | Mag R | Mag I | Sp type |
#ref
1850 - 2024 |
#notes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | * lam Ori A | Em* | 05 35 08.2760807112 | +09 56 02.991326316 | 2.17 | 3.48 | 3.47 | O8III((f)) | 509 | 0 | ||
| 2 | NAME Ori Trapezium | OpC | 05 35 16.5 | -05 23 14 | ~ | 1619 | 1 | |||||
| 3 | M 42 | HII | 05 35 17 | -05 23.4 | ~ | 4073 | 0 | |||||
| 4 | NAME lam Ori Molecular Ring | HII | 05 35.3 | +09 56 | ~ | 75 | 1 | |||||
| 5 | NAME Ori A | MoC | 05 38 | -07.1 | ~ | 3008 | 0 | |||||
| 6 | NAME Lower's Nebula | HII | 06 08 44 | +15 40.5 | ~ | 33 | 0 | |||||
| 7 | HD 41997 | * | 06 08 55.8226126488 | +15 42 18.192106044 | 8.16 | 9.47 | 9.13 | 8.83 | O7.5Vn((f)) | 98 | 0 | |
| 8 | NGC 2175 | OpC | 06 09 39 | +20 29.2 | 7.0 | 6.8 | ~ | 261 | 3 | |||
| 9 | HD 42088 | * | 06 09 39.5728368936 | +20 29 15.450599580 | 6.73 | 7.58 | 7.57 | 8.45 | O6V((f))z | 244 | 0 | |
| 10 | LBN 006.00+24.73 | HII | 16 35 56.8 | -12 43 05 | ~ | 62 | 0 | |||||
| 11 | * zet Oph | Be* | 16 37 09.5400587698 | -10 34 01.509742704 | 1.73 | 2.58 | 2.56 | 2.46 | 2.50 | O9.2IVnn | 1839 | 0 |
| 12 | NGC 7000 | Cl* | 20 58 47 | +44 19.8 | ~ | 399 | 0 |
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