J/MNRAS/517/484ivo://CDS.VizieR/J/MNRAS/517/484doi:10.26093/cds/vizier/bg-g5-f4CDSNardiello D.Bedin L.R.Burgasser A.Salaris M.Cassisi S.Griggio M.,Scalco M.2026-08-03T07:32:05Z2025-11-18T13:25:06ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frglobular-star-clustersphotometryvisible-astronomyinfrared-astronomyAs the James Webb Space Telescope (JWST) has become fully operational, early release data are now available to begin building the tools and calibrations for precision point-source photometry and astrometry in crowded cluster environments. Here, we present our independent reduction of NIRCam imaging of the metal-poor globular cluster M 92, which were collected under Director's Discretionary Early Release Science programme ERS-1334. We derived empirical models of the point spread function (PSF) for filters F090W, F150W, F277W, and F444W, and find that these PSFs: (i) are generally undersampled (FWHM ~ 2 pixel) in F150W and F444W and severely undersampled (FWHM ~ 1 pixel) in F090W and F277W; (ii) have significant variation across the field of view, up to ~15-20 per cent; and (iii) have temporal variations of ~ 3-4 per cent across multi-epoch exposures. We deployed our PSFs to determine the photometric precision of NIRCam for stars in the crowded, central regions of M 92, measured to be at the ~0.01 mag level. We use these data to construct the first JWST colour-magnitude diagrams of a globular cluster. Employing existing stellar models, we find that the data reach almost the bottom of the M 92 main sequence (~0.1 M_{sun}_), and reveal 24 white dwarf candidate members of M 92 in the brightest portion of the white dwarf cooling sequence. The latter are confirmed through a cross-match with archival HST UV and optical data. We also detect the presence of multiple stellar populations along the low-mass main sequence of M 92.2022MNRAS.517..484Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/517/484CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/AJ/149/153 : Abundances of red giants in 10 globular clustersJ/ApJ/797/15 : HST/WFC3 observations in 4 metal-poor GCs of FornaxVII/195 : Globular Clusters in the Milky Way (Harris, 1996)VII/202 : Globular Clusters in the Milky Way (Harris, 1997)J/AJ/133/1658 : ACS survey of galactic globular clusters (Sarajedini+, 2007)J/MNRAS/463/1780 : Exoplanet candidates in Praesepe (M 44) (Libralato+, 2016)J/MNRAS/463/1831 : M67 Kepler/K2 variable stars (Nardiello+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/517/484https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/517/484http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/517/484https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/517/484https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/517/484http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/517/484GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/MNRAS/517/484/f090wa1Star sources NIRCam PSF photometry in F090W, SW module A and channel 1 of the detectorrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXX stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.x;instr.detfloatYY stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.y;instr.detfloatXmagCalibrated Vega magnitude of NIRCam JWST in filter as the file's names indicate F090W, F150W, F277W and F444W (MAG)magphot.mag;obsfloate_XmagPhotometric error of Xmag (SIGMA_MAG)magstat.error;phot.magfloatQfitThe quality of a PSF model fit to an individual star where the smaller is the qfit the better the PSF fit is (QFIT)stat.fit.goodness;instr.det.psf;meta.modelledfloatJ/MNRAS/517/484/f090wa2Star sources NIRCam PSF photometry in F090W, SW module A and channel 2 of the detectorrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXX stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.x;instr.detfloatYY stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.y;instr.detfloatXmagCalibrated Vega magnitude of NIRCam JWST in filter as the file's names indicate F090W, F150W, F277W and F444W (MAG)magphot.mag;obsfloate_XmagPhotometric error of Xmag (SIGMA_MAG)magstat.error;phot.magfloatQfitThe quality of a PSF model fit to an individual star where the smaller is the qfit the better the PSF fit is (QFIT)stat.fit.goodness;instr.det.psf;meta.modelledfloatJ/MNRAS/517/484/f090wa3Star sources NIRCam PSF photometry in F090W, SW module A and channel 3 of the detectorrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXX stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.x;instr.detfloatYY stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.y;instr.detfloatXmagCalibrated Vega magnitude of NIRCam JWST in filter as the file's names indicate F090W, F150W, F277W and F444W (MAG)magphot.mag;obsfloate_XmagPhotometric error of Xmag (SIGMA_MAG)magstat.error;phot.magfloatQfitThe quality of a PSF model fit to an individual star where the smaller is the qfit the better the PSF fit is (QFIT)stat.fit.goodness;instr.det.psf;meta.modelledfloatJ/MNRAS/517/484/f090wa4Star sources NIRCam PSF photometry in F090W, SW module A and channel 4 of the detectorrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXX stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.x;instr.detfloatYY stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.y;instr.detfloatXmagCalibrated Vega magnitude of NIRCam JWST in filter as the file's names indicate F090W, F150W, F277W and F444W (MAG)magphot.mag;obsfloate_XmagPhotometric error of Xmag (SIGMA_MAG)magstat.error;phot.magfloatQfitThe quality of a PSF model fit to an individual star where the smaller is the qfit the better the PSF fit is (QFIT)stat.fit.goodness;instr.det.psf;meta.modelledfloatJ/MNRAS/517/484/f090wb1Star sources NIRCam PSF photometry in F090W, SW module B and channel 1 of the detectorrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXX stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.x;instr.detfloatYY stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.y;instr.detfloatXmagCalibrated Vega magnitude of NIRCam JWST in filter as the file's names indicate F090W, F150W, F277W and F444W (MAG)magphot.mag;obsfloate_XmagPhotometric error of Xmag (SIGMA_MAG)magstat.error;phot.magfloatQfitThe quality of a PSF model fit to an individual star where the smaller is the qfit the better the PSF fit is (QFIT)stat.fit.goodness;instr.det.psf;meta.modelledfloatJ/MNRAS/517/484/f090wb2Star sources NIRCam PSF photometry in F090W, SW module B and channel 2 of the detectorrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXX stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.x;instr.detfloatYY stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.y;instr.detfloatXmagCalibrated Vega magnitude of NIRCam JWST in filter as the file's names indicate F090W, F150W, F277W and F444W (MAG)magphot.mag;obsfloate_XmagPhotometric error of Xmag (SIGMA_MAG)magstat.error;phot.magfloatQfitThe quality of a PSF model fit to an individual star where the smaller is the qfit the better the PSF fit is (QFIT)stat.fit.goodness;instr.det.psf;meta.modelledfloatJ/MNRAS/517/484/f090wb3Star sources NIRCam PSF photometry in F090W, SW module B and channel 3 of the detectorrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXX stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.x;instr.detfloatYY stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.y;instr.detfloatXmagCalibrated Vega magnitude of NIRCam JWST in filter as the file's names indicate F090W, F150W, F277W and F444W (MAG)magphot.mag;obsfloate_XmagPhotometric error of Xmag (SIGMA_MAG)magstat.error;phot.magfloatQfitThe quality of a PSF model fit to an individual star where the smaller is the qfit the better the PSF fit is (QFIT)stat.fit.goodness;instr.det.psf;meta.modelledfloatJ/MNRAS/517/484/f090wb4Star sources NIRCam PSF photometry in F090W, SW module B and channel 4 of the detectorrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXX stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.x;instr.detfloatYY stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.y;instr.detfloatXmagCalibrated Vega magnitude of NIRCam JWST in filter as the file's names indicate F090W, F150W, F277W and F444W (MAG)magphot.mag;obsfloate_XmagPhotometric error of Xmag (SIGMA_MAG)magstat.error;phot.magfloatQfitThe quality of a PSF model fit to an individual star where the smaller is the qfit the better the PSF fit is (QFIT)stat.fit.goodness;instr.det.psf;meta.modelledfloatJ/MNRAS/517/484/f150wa1Star sources NIRCam PSF photometry in F150W, SW module A and channel 1 of the detectorrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXX stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.x;instr.detfloatYY stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.y;instr.detfloatXmagCalibrated Vega magnitude of NIRCam JWST in filter as the file's names indicate F090W, F150W, F277W and F444W (MAG)magphot.mag;obsfloate_XmagPhotometric error of Xmag (SIGMA_MAG)magstat.error;phot.magfloatQfitThe quality of a PSF model fit to an individual star where the smaller is the qfit the better the PSF fit is (QFIT)stat.fit.goodness;instr.det.psf;meta.modelledfloatJ/MNRAS/517/484/f150wa2Star sources NIRCam PSF photometry in F150W, SW module A and channel 2 of the detectorrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXX stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.x;instr.detfloatYY stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.y;instr.detfloatXmagCalibrated Vega magnitude of NIRCam JWST in filter as the file's names indicate F090W, F150W, F277W and F444W (MAG)magphot.mag;obsfloate_XmagPhotometric error of Xmag (SIGMA_MAG)magstat.error;phot.magfloatQfitThe quality of a PSF model fit to an individual star where the smaller is the qfit the better the PSF fit is (QFIT)stat.fit.goodness;instr.det.psf;meta.modelledfloatJ/MNRAS/517/484/f150wa3Star sources NIRCam PSF photometry in F150W, SW module A and channel 3 of the detectore_XmagPhotometric error of Xmag (SIGMA_MAG)magstat.error;phot.magfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXX stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.x;instr.detfloatYY stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.y;instr.detfloatXmagCalibrated Vega magnitude of NIRCam JWST in filter as the file's names indicate F090W, F150W, F277W and F444W (MAG)magphot.mag;obsfloatQfitThe quality of a PSF model fit to an individual star where the smaller is the qfit the better the PSF fit is (QFIT)stat.fit.goodness;instr.det.psf;meta.modelledfloatJ/MNRAS/517/484/f150wa4Star sources NIRCam PSF photometry in F150W, SW module A and channel 4 of the detectorrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXX stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.x;instr.detfloatYY stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.y;instr.detfloatXmagCalibrated Vega magnitude of NIRCam JWST in filter as the file's names indicate F090W, F150W, F277W and F444W (MAG)magphot.mag;obsfloate_XmagPhotometric error of Xmag (SIGMA_MAG)magstat.error;phot.magfloatQfitThe quality of a PSF model fit to an individual star where the smaller is the qfit the better the PSF fit is (QFIT)stat.fit.goodness;instr.det.psf;meta.modelledfloatJ/MNRAS/517/484/f150wb1Star sources NIRCam PSF photometry in F150W, SW module B and channel 1 of the detectorrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXX stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.x;instr.detfloatYY stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.y;instr.detfloatXmagCalibrated Vega magnitude of NIRCam JWST in filter as the file's names indicate F090W, F150W, F277W and F444W (MAG)magphot.mag;obsfloate_XmagPhotometric error of Xmag (SIGMA_MAG)magstat.error;phot.magfloatQfitThe quality of a PSF model fit to an individual star where the smaller is the qfit the better the PSF fit is (QFIT)stat.fit.goodness;instr.det.psf;meta.modelledfloatJ/MNRAS/517/484/f150wb2Star sources NIRCam PSF photometry in F150W, SW module B and channel 2 of the detectorrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXX stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.x;instr.detfloatYY stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.y;instr.detfloatXmagCalibrated Vega magnitude of NIRCam JWST in filter as the file's names indicate F090W, F150W, F277W and F444W (MAG)magphot.mag;obsfloate_XmagPhotometric error of Xmag (SIGMA_MAG)magstat.error;phot.magfloatQfitThe quality of a PSF model fit to an individual star where the smaller is the qfit the better the PSF fit is (QFIT)stat.fit.goodness;instr.det.psf;meta.modelledfloatJ/MNRAS/517/484/f150wb3Star sources NIRCam PSF photometry in F150W, SW module B and channel 3 of the detectorrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXX stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.x;instr.detfloatYY stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.y;instr.detfloatXmagCalibrated Vega magnitude of NIRCam JWST in filter as the file's names indicate F090W, F150W, F277W and F444W (MAG)magphot.mag;obsfloate_XmagPhotometric error of Xmag (SIGMA_MAG)magstat.error;phot.magfloatQfitThe quality of a PSF model fit to an individual star where the smaller is the qfit the better the PSF fit is (QFIT)stat.fit.goodness;instr.det.psf;meta.modelledfloatJ/MNRAS/517/484/f150wb4Star sources NIRCam PSF photometry in F150W, SW module B and channel 4 of the detectorrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXX stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.x;instr.detfloatYY stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.y;instr.detfloatXmagCalibrated Vega magnitude of NIRCam JWST in filter as the file's names indicate F090W, F150W, F277W and F444W (MAG)magphot.mag;obsfloate_XmagPhotometric error of Xmag (SIGMA_MAG)magstat.error;phot.magfloatQfitThe quality of a PSF model fit to an individual star where the smaller is the qfit the better the PSF fit is (QFIT)stat.fit.goodness;instr.det.psf;meta.modelledfloatJ/MNRAS/517/484/f277waStar sources NIRCam PSF photometry in F277W, LW module ArecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXX stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.x;instr.detfloatYY stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.y;instr.detfloatXmagCalibrated Vega magnitude of NIRCam JWST in filter as the file's names indicate F090W, F150W, F277W and F444W (MAG)magphot.mag;obsfloate_XmagPhotometric error of Xmag (SIGMA_MAG)magstat.error;phot.magfloatQfitThe quality of a PSF model fit to an individual star where the smaller is the qfit the better the PSF fit is (QFIT)stat.fit.goodness;instr.det.psf;meta.modelledfloatJ/MNRAS/517/484/f277wbStar sources NIRCam PSF photometry in F277W, LW module BrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXX stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.x;instr.detfloatYY stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.y;instr.detfloatXmagCalibrated Vega magnitude of NIRCam JWST in filter as the file's names indicate F090W, F150W, F277W and F444W (MAG)magphot.mag;obsfloate_XmagPhotometric error of Xmag (SIGMA_MAG)magstat.error;phot.magfloatQfitThe quality of a PSF model fit to an individual star where the smaller is the qfit the better the PSF fit is (QFIT)stat.fit.goodness;instr.det.psf;meta.modelledfloatJ/MNRAS/517/484/f444waStar sources NIRCam PSF photometry in F444W, LW module ArecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXX stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.x;instr.detfloatYY stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.y;instr.detfloatXmagCalibrated Vega magnitude of NIRCam JWST in filter as the file's names indicate F090W, F150W, F277W and F444W (MAG)magphot.mag;obsfloate_XmagPhotometric error of Xmag (SIGMA_MAG)magstat.error;phot.magfloatQfitThe quality of a PSF model fit to an individual star where the smaller is the qfit the better the PSF fit is (QFIT)stat.fit.goodness;instr.det.psf;meta.modelledfloatJ/MNRAS/517/484/f444wbStar sources NIRCam PSF photometry in F444W, LW module BrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXX stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.x;instr.detfloatYY stellar position in the reference system of the detectorpixmeta.ref.url;pos.cartesian.y;instr.detfloatXmagCalibrated Vega magnitude of NIRCam JWST in filter as the file's names indicate F090W, F150W, F277W and F444W (MAG)magphot.mag;obsfloate_XmagPhotometric error of Xmag (SIGMA_MAG)magstat.error;phot.magfloatQfitThe quality of a PSF model fit to an individual star where the smaller is the qfit the better the PSF fit is (QFIT)stat.fit.goodness;instr.det.psf;meta.modelledfloatJ/MNRAS/517/484/listList of fits imagesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar