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Table 2

Distance of the known H II regions.

Name b CO velocity Distance (B74) Distance (C85) Recent distance Method References
(°) (°) (km s-1) (kpc) (kpc) (kpc) see notes
(1) (2) (3) (4) (5) (6) (7) (8) (9)

BFS 52 19190 +085 7.3  ±  0.5 ···    ···    / p 1/2
SH 2-253 19223 +359 14.4  ±  0.5 ···    ···    5.1  ±  1.5 s 3
SH 2-254 19249 –015 7.5  ±  0.7 1.12  ±  0.92 2.5 p 2
SH 2-255 19264 –001 7.5  ±  0.7 0.88  ±  0.80 2.5 p 2
SH 2-256 19262 –013 7.5  ±  0.7 ···    2.5 p 2
SH 2-257 19261 –007 7.5  ±  0.7 1.34  ±  0.95 ···    p 2
SH 2-258 19273 +005 7.5  ±  0.7 ···    2.5 p† 2
SH 2-259 19294 –058 22.8  ±  0.5 ···    8.3 8.9  ±  2.7 s 3
SH 2-261 19410 –190 ···    0.90  ±  0.80 2.3/2.1 1.6  ±  0.5 s 3
SH 2-266 19566 –008 31.2  ±  1.1 ···    ···    2.0  ±  0.6 s 3
SH 2-267 19620 –120 ···    ···    ···     ~4.2 s 4
SH 2-268 19640 –280 4.8  ±  0.5 ···    ···    1.3  ±  0.4 s 3
SH 2-269 19640 –170 17.5  ±  0.7 1.88  ±  0.80 ···    p 5
SH 2-270 19684 –311 25.6  ±  0.4 ···    ···    6.8  ±  2.3 k 3
SH 2-271 19777 –231 20.5  ±  0.5 ···    ···    5.1  ±  1.1 s 3
SH 2-272 19781 –228 20.5  ±  0.5 ···    ···    5.1  ±  1.1 s 3

Notes. The source names are listed in Col. (1) and the central coordinates are in Cols. (2) and (3). The radial velocities of the peak CO emission associated with the H II regions are given in Col. (4). Columns (5) and (6) are the distances in Berkhuijsen (1974, B74) and Caswell (1985, C85). The distances taken from the recent literature are listed in Col. (7) with the distance measurement method given in Col. (8), and the references are given in Col. (9).p: parallax; p: associated with SH 2-252 or SH 2-254; p†: SH 2-254 to 258 are regarded to have the same distance; s: stellar distance; k: kinematic distance.

References. (1) Reid et al. (2009), (2) Rygl et al. (2010), (3) Russeil (2003), (4) Lahulla (1987), (5) Honma et al. (2007).

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