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Originally Posted by Merlin66
- For unsaturated star images, the maximum size of the star is similar to the Airy disk in diameter.
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False. The Airy Disk does not have a diameter. It is a pattern, patterns don't have diameters. You could, however, say that 83% of all starlight of the imaged star should be contained within the area that extends from the center to the first minimum.
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- The FWHM of the star image is reasonably constant.
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False. The FWHM is dependent on how well you can fit a Gaussian curve to a star. You will be able to fit a Gaussian curve less well to saturated stars, depending on the response of the CCD you're using. It is also neigh impossible to fit a gaussian curve to undersampled images.
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- As the star image saturates, the “flat top” extends out to the diameter of the Airy disk.
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False. It can extend way beyond the first minimum.
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- Also, for saturated star images the “wings” include additional energy from the outer rings, and can extend, in linear diameter, to and slightly beyond the dimensions of the 1st Airy ring.
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False. They extend throughout the whole image.