Table 1
Parameters of the sources observed in our pilot survey.
| Source | RA(J2000) | Dec(J2000) | Continuum (mJy)a | Distance | Luminosityb | References | |
| name | (hms) | (°′′′) | 2.7 mm | 1.3 mm | (kpc) | (103L⊙) | |
|
|
|||||||
| RRL detections | |||||||
| CRL 618 | 04:42:53.64 | +36:06:53.4 | 2395±17 | 2670±50 | 0.9 | 8.5 | 10, 19, 20, 21, 25, 29 |
| M 2-9 | 17:05:37.96 | −10:08:32.5 | 121±3 | 180±10 | 0.65, 1.3† | 0.7, 3.0† | 5, 6, 8, 17 |
| MWC 922 | 18:21:15.91 | −13:01:27.1 | 109±2 | 203±5 | 1.7, 3.0† | 18, 59† | 2, 15, 16, 28 |
| RRL non-detections | |||||||
| Hen 3-1475 | 17:45:14.19 | −17:56:46.9 | 6±2 | 31±10 | 5 | 9 | 11, 14, 18 |
| PN M 1-91 | 19:32:57.69 | +26:52:43.1 | 12±1 | 23±3 | 2.1 | 0.3 | 6, 12, 17, 27 |
| PN M 1-92 | 19:36:18.90 | +29:32:49.9 | 18±2 | 86±2 | 2.5 | 10 | 1, 3, 4, 9, 17, 22 |
| IRAS 20462+3416 | 20:48:16.63 | +34:27:24.3 | 6±2 | 16±3 | 3.5 | 0.8 | 13, 22, 24, 26 |
| PN M 2-56 | 23:56:36.38 | +70:48:17.9 | 6±1 | 39±4 | 2.1 | 5.5 | 7, 17, 23 |
Notes. All targets have stellar effective temperatures in the range Teff ~ 20 000–40 000 K, which correspond to early-B to late-O spectral types.
Continuum flux measured by us near the H39α (2.7 mm) and H41α (1.3 mm) RRLs. The formal errors of the continuum fluxes, averaging all line-free channels within the observed sub-band, do not include the absolute flux calibration uncertainties, which can be up to 20 and 30% at 3 and 1 mm, respectively.
Uncertain distance: two possible values and the corresponding luminosities are given (see Sects. 2.2 and 2.3).
Reference. (1) Alcolea et al. (2007); (2) Allen & Swings (1976); (3) Arrieta et al. (2005); (4) Bujarrabal et al. (1998); (5) Bujarrabal et al. (2001); (6) Calvet & Cohen (1978); (7) Castro-Carrizo et al. (2002); (8) Castro-Carrizo et al. (2012); (9) Cohen& Kuhi (1977); (10) Goodrich (1991); (11) Huggins et al. (2004); (12) Lee et al. (2007); (13) Parthasarathy (1993); (14) Riera et al. (1995); (15) Rodríguez et al. (2012); (16) Rudy et al. (1992); (17) Sánchez Contreras et al. (1998); (18) Sánchez Contreras & Sahai (2001); (19) Sánchez Contreras et al. (2002); (20) Sánchez Contreras & Sahai (2004); (21) Sánchez Contreras et al. (2004); (22) Sánchez Contreras et al. (2008); (23) Sánchez Contreras et al. (2010); (24) Sánchez Contreras & Sahai (2012); (25) Schmidt & Cohen (1981); (26) Suárez et al. (2006); (27) Torres-Peimbert et al. (2010); (28) Tuthill & Lloyd (2007); (29) Westbrook et al. (1975).
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