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Table 1
Observations and data reduction results.
| SMC | B68 | cb131 | Circinus | |
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| α (J2000) | 00:52:41.3 | 17:22:40.7 | 18:16:59.4 | 14:59:28.9 |
| δ (J2000) | −72:49:14.3 | −23:49:47.2 | −18.01:53.2 | −63:06:10.1 |
| central gas density | – | 2.61 × 105 cm-3 | 1.8 × 105 cm-3 | |
| center-to-edge density contrast | – | 16.5 | 140. | |
| central column density Nl | – | 2.59 × 1022 cm-2 | 5.8 × 1022 cm-2 | |
| distance of nebula | – | 80 pc | 190 pc | 170 pc |
| minor axis of nebula | – | 17 000 AU | 24 000 AU | complex |
| distance of sources | 62 kpc | ~8 kpc | ~7 kpc | ~7 kpc |
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| light-curve duration night 1 (hours) | 2.18 | 4.77 | 1.25 | 1.84 |
| light-curve duration night 2 | 2.63 | 5.07 | 1.74 | 2.16 |
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| number of detected stars | 5042 | 9599 | 9084 | 5249 |
| number of monitored stars | 691 | 1114 | 2779 | 913 |
| magnitude of monitored stars | J < 17.8 | Ks < 17.1 | Ks < 17.1 | Ks < 17.1 |
| fraction of stars behind dust | 0% | 46% | 64% | – |
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| mean number of measurements/star | 980 | 2013 | 629 | 888 |
Notes. The data on the nebulae are taken from Hotzel et al. (2002) for B68 and from Bacmann et al. (2000) for cb131. The typical distance of the sources in the Galactic plane are taken from Georgelin et al. (1994) and Russeil et al. (1998).
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