Table 1
Positions, flux densities, and diameters of the cores.
| Peak position | Source diameter | |||||||
|---|---|---|---|---|---|---|---|---|
| α(J2000) | δ(J2000) |  |
 |
 |
FWHMc |  |
 |
|
| Core | h m s | °′′′ | (K) | (Jy beam−1) | (Jy) | (arcsec) | (arcsec) | (au) |
| G31-Main | 18 47 34.309 | − 01 12 45.99 | 132 ± 1 | 0.238 ± 0.002 | 3.10 ± 0.05 | 0.70 ± 0.04 | 0.67 ± 0.04 | 5300 ± 300 |
| G31-NE | 18 47 34.407 | − 01 12 44.79 | 8 ± 1 | 0.015 ± 0.002 | 0.052 ± 0.002 | 0.61 ± 0.04 | 0.56 ± 0.04 | 4500 ± 300 |
Notes. Derived from the continuum dust emission. (a)The conversion factor from Jy beam−1 to K is 555.5. (b)Peak intensity and integrated flux density corrected for primary beam response. (c) FWHM = 
, where A is the area inside the contour at half maximum. (d)Deconvolved diameter, calculated assuming that the cores are symmetric Gaussians, using the expression 
, where HPBW is the half-power width of the synthesized beam. The distance to G31 is assumed to be 7.9 kpc.
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