Table 6
Proposed criteria for defining the evolutionary status of our sample sources based on the derived dust emissivity spectral index, β; the dust and bolometric temperatures, Td and Tbol; the presence or not of an outflow; and the presence or not of a compact radio continuum source.
| Evolutionary status | β | Td/Tbol | Outflow | Compact radio continuum |
|---|---|---|---|---|
| K | (Y/N) | (Y/(Y)/N) | ||
| PSC | 1–2 | Td ≤ 10 | N | N |
| Class 0 | ≤1.5 | Tbol < 70 | Y | Y |
| Class I | ≤1 | Tbol ≥ 70 | Y | Y |
| More evolved (≥Class II) | 0–1 | Td ∈ [10−100] | Y | (Y) |
Notes. The range of the dust emissivity spectral index and temperature are based on the discussion in Sect. 2.
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