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Table 1.
Summary of source categories and type detected in the ALMA 3-mm observations.
| Category | Source number |
|---|---|
| ALMA only | 51 |
| ALMA+optical only | 30 |
| ALMA+optical+radio | 20 |
| Total | 101 |
| Wolf Rayets | 21 |
| YHGs | 4 |
| RSGs | 4 |
| BHGs | 3 |
| LBV | 1 |
| sgB[e] | 1 |
| OB supergiants | 16 |
| Total | 50 |
Notes. N.B. seven of the ALMA-only sources are associated with the extended nebulae of Wd1-4 and Wd1-20, see Sect. 3.1 for details.
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