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Table 4

Main ionizing stars of the neighboring H ii regions.

ID V B − V U − B A V A V M V Spectral Spectral
(sp) (phot) typea typeb

N21 3 15.40 0.69 –4.22 O9 O8.5
N22 86 14.30 –0.09 –0.96 0.48 0.63 –5.11 O7 O5.5
N22 92 14.25 –0.19 –0.96 0.57 0.27 –5.25 O7 O5
N22 97 16.44 –0.02 0.42 –2.91 B1
N22 136 15.44 –0.10 0.57 –4.06 BO O9
N22 155 15.98 –0.19 0.42 –3.37 B0
N23 35 17.60 –0.24 B
N25 182 14.25 –0.13 –0.95 0.33 0.48 –5.01 O7 O5.5

Notes. U − B values in Col. 4 are taken from the Massey catalog. In Col. 5, AV values are derived from the Hα/Hβ ratios (Table 2). In Col. 6 AV values are calculated using the Q parameter (Massey et al. 1995). In Col. 7, MV values are estimated using AV from Col. 5.

(a)

Spectral types (luminosity class V) derived from Schmidt-Kaler (1982).

(b)

Spectral types from Martins et al. (2005).

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