Table 1
Some basic properties of the sample of dark nebulae and the additional UV sources of illumination for LDN 1780.
| Object | RA | Dec | l | b | d (pc) | AV range (mag) | AV max (mag) | Ref. |
|---|---|---|---|---|---|---|---|---|
| LDN 1642 | 04:36 | − 14:12 | 210.9 | − 36.5 |  |
0–4 | >10 | 1 |
| LDN 1780 | 15:40 | − 07:15 | 359.0 | 37.0 | 110 ± 10 | 0.4–3.5 | ~4 | 1 |
| LBN 406 (Draco nebula, “Head”) | 16:48 | 59:55 | 90.0 | 39.0 | ~800 | 0–1.3 | ~2 | 2 |
| Sco OB2 | 16:15 | − 24:12 | 351.4 | 19.0 | 144 ± 3 | 0.11–1.76 | 3 | |
| ζ Oph | 16:37 | − 10:34 | 6.3 | 23.6 | 112 ± 3 | 0.90 | 4 |
Notes. The last column gives the reference fordistance and AV range refers to the range of observed positions in the present study.
References. (1) Schlafly et al. (2014), (2) Penprase & Blades (2000), Gladders et al. (1998), (3) de Zeeuw et al. (1999), Gordon et al. (1994), (4) van Leeuwen (2007), Liszt et al. (2009).
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