Table 2
Measured mean FWHM and its resulting 3σ uncertainty from the distribution of savesets.
| Object | On source [s] | % of frame | FWHML [′′ ] | FWHMP [′′] |
|---|---|---|---|---|
| HD 169414 | 273 (PAH-1) | 69 | 0.213 ± 0.004 | 0.233 ± 0.003 |
| HD 179218 | 1501 (PAH-1) | 81 | 0.232 ± 0.003 | 0.255 ± 0.002 |
| HD 187642 | 314 (PAH-1) | 79 | 0.217 ± 0.004 | 0.234 ± 0.003 |
| HD 169414 | 287 (PAH-2) | 70 | 0.267 ± 0.002 | 0.282 ± 0.002 |
| HD 179218 | 1651(PAH-2) | 91 | 0.280 ± 0.001 | 0.298 ± 0.001 |
| HD 187642 | 382 (PAH-2) | 91 | 0.268 ± 0.002 | 0.285 ± 0.002 |
| HD 169414 | 397 (Si-6) | – | – | – |
| HD 179218 | 1667 (Si-6) | 90 | 0.293 ± 0.001 | 0.313 ± 0.002 |
| HD 187642 | 364 (Si-6) | 91 | 0.294 ± 0.002 | 0.311 ± 0.003 |
Notes.
FWHML is estimated through a Lorentzian
fit of the saveset’s PSF. The term σ
is here the error on the mean of the distribution, that is, the estimated root mean square divided by
with
N being the number of
selected frames. FWHMP
is estimatedgraphically from the PSF profile according to the definition of the FWHM. The reported
3σ
uncertainty is computed from the mean and error on the mean of the distribution of radial profile computed for each saveset.
Therefore, the uncertainty obtained with both methods are comparable.
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