Table 2
Parameters of the best fit to the interferometric observables of the 2.2µm, Brγ, and CO emission towards G033.3891.
| Model | Size | PA (slant) | Offset(b) | PA (offset)t | Flux w. | Flux w. | Red. χ2(e) | |
|---|---|---|---|---|---|---|---|---|
| (mas) | (degrees) | (mas) | (degrees) | (point) | (extended) | |||
| 2.2 µm | Ring(c) | Rin − Rout: 1.00±0.04 − 1.40±0.03 | 70±6 | 0 | na(a) | 0.5±0.1 | 0.36±0.04(f) | 1.2 |
| 2.2 µm | Gaussian | FWHM: 0.95 ±0.07 | na | 0 | na | na | 1.0(f) | 2.2 |
| 2.2 µm | Uniform disc | Radius: 1.09±0.01 | na | 0 | na | 0.67±0.04 | 0.17±0.01(f) | 1.8 |
| Brγ | Ring | Rin -Rout: 1.91±O.4-2.39±O.6 | na | 0.61 ±0.07 | 36±6 | na | 1.0 | 3.5 |
| Brγ | Gaussian(d) | FWHM: 0.66±0.06 | na | 0.4±0.1 | 41.4±3.3 | na | 1.0 | 3.2 |
| Brγ | Uniform disc | Radius: 1.52±0.08 | na | 0.26±0.03 | 67.4±6.5 | na | 1.0 | 4.0 |
| CO | Ring | Rin − Rout: 0.55±0.06 − 0.75 (fixed) | 70±6 | 0 | na | na | 1.0 | 3.0 |
| CO | Gaussian | FWHM: 0.79±0.02 | na | 0 | na | na | 1.0 | 4.6 |
| CO | Uniform disc | Radius: 0.65±0.04 | na | 0 | na | na | 1.0 | 4.5 |
Notes. (a) na: not applicable. (b) The offset was measured with respect to the continuum photocentre. (c) For the entire analysis, we adopted the solution of the ring brightness distribution for the 2.2 µm continuum and the CO bandheads emission. (d) For the entire analysis, we adopted the solution of the Gaussian distribution for the Brγ emission. (e) The reported reduced χ2 values correspond to the total fit of all interferometric observables combined.(f) An additional over-resolved (background) component, accounting for 16% of the total flux contribution, was applied to all geometric models of the continuum.
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