Table C.1
Fitted parameters from the chromatic geometric model applied to VLTI/MIDI and VLTI/MATISSE N-band observations of 3 Puppis.
| VLTI | EG comp. | PS comp. | |||||
|---|---|---|---|---|---|---|---|
| instrument | FWHM (mas) | e (...) | PA(°) | fEG (% total flux) | fPS (% total flux) | ||
| 8.0 μm | 12 μm | 8.0 μm | 12 μm | achromatic | achromatic | achromatic | |
| MIDI | 16 ± 1 | 28 ± 2 | 1.00 ± 0.05 | 1.70 ± 0.30 | 22 ± 59 | 77 ± 3 | 23 ± 3 |
| MATISSE | 23.0 ± 0.5 | 30.0 ± 0.5 | 1.50 ± 0.05 | 1.20 ± 0.05 | -14 ± 1 | 83 ± 1 | 17 ± 1 |
Notes. The chromatic geometric modelling consists of an centred elliptical Gaussian disc component (EG comp.) and a point source component (PS comp.) which describes the fully resolved component at the centre of the image. Two chromatic parameters set to free are the FWHM size of the major-axis of the Gaussian disc (FWHM) and its elongation ratio (e). The disc major-axis’ position angle (PA) and the relative flux contribution of the disc (fEG) are the two remaining free parameters of the model fitting that were set as achromatic. The relative flux for the point source component is inferred from the formula fPS = 100% − fEG.
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