Table 1
Properties of the four H ii region bubbles of Mon R2.
| Region name | Type | Exciting star from visual spectra | Ionisation from 21 cm free-free | RH ii | ρe | ||||
| Ident. | Sp.T. | AV[mag] | S21cm [mJy] | NLyc [s-1] | Sp.T. | [pc] | [cm-3] | ||
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|
|
|||||||||
| central | UC | IRS1 | – | – | 4114. | 2.4 × 1047 | B0 | 0.09 ± 0.01 | 3200 |
| western (vdB67) | Compact | BD-06 1415 | B1 | 2.7 | 27.4 | 1.6 × 1045 | B1 | 0.11 ± 0.01 | ~200 |
| eastern (vdB69) | Compact | BD-06 1418 | B2.5 | 1.7 | 2.2 | 1.3 × 1044 | B2.5 | 0.08 ± 0.01 | ~100 |
| northern (vdB68) | Extended | HD 42004 | B1.5 | 1.6 | 38. | 2.2 × 1045 | B1 | 0.8 ± 0.05 | ~10 |
Notes. The Mon R2 UCH ii region is also called G213.71-12.6 or IRAS 06052-0622. Spectral types in Cols. 4 and 8 are given by Racine (1968) from visual spectra and from NLyc estimates derived from NVSS 21 cm data and Eq. (1) (see Cols. 6, 7). Extinctions given in Col. 5 are estimated from E(B−V) given by Herbst & Racine (1976). The radii and electron density of the H ii region bubbles (Cols. 9, 10) are estimated from the Herschel dust temperature and column density images (see Sects. 3.2−3.5).
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