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JWST imaging of the closest globular clusters—I. Possible infrared excess among white dwarfs in NGC 6397
Salaris, M.; Apai, D.; Anderson, J. +9 more
We present James Webb Space Telescope observations of the globular cluster NGC 6397 and use them to extend to infrared wavelengths the characterization of the cluster's entire white dwarf (WD) cooling sequence (CS). The data allows us to probe fundamental astrophysical WD properties and to search for evidence in their colors for (or against) the e…
Photometry and astrometry with JWST‑II: NIRCam distortion correction
Bedin, L. R.; Nardiello, D.; Griggio, M.
In preparation to make the most of our own planned James Webb Space Telescope investigations, we take advantage of publicly available calibration and early‑science observations to independently derive and test a geometric‑distortion solution for NIRCam detectors. Our solution is able to correct the distortion to better than 0.2 mas. Current data i…