JWST Resolved Stellar Populations Early Release Science ("JWSTSTARS")

The JWST Resolved Stellar Population Early Release Science (ERS) Program obtained NIRCam and NIRISS imaging of 3 resolved stellar targets in the Local Group: globular cluster M92, ultra-faint dwarf galaxy Draco II, and star-forming dwarf galaxy WLM. NIRCam was the primary instrument and observed each target in 4 filters: M92 (F090W, F150W, F277W, F444W), Draco II (F090W, F150W, F360M, F480M), WLM (F090W, F150W, F250M, F430M). NIRISS was used in parallel and obtained imaging in 2 filters (F090W, F150W). The 3rd exposure of M92, for both NIRCam and NIRISS, is not included in the analysis as it suffered from excess astrometric jitter and cannot produce adequate photometry. See Weisz et al. 2024 for more details.

Using this imaging data, the ERS team developed JWST NIRCam and NIRISS modules for DOLPHOT, a crowded field stellar photometry package widely used in nearby galaxies. This data release includes the full, multiband photometric catalogs produced by DOLPHOT for each field and the id2 drizzled reference images used for astrometrically aligning images for each target. The NIRISS field for Draco II did not contain prominent member stars, and the photometric catalog is not included in this data release.  

The FITS images used for this data release have the following JWST pipeline versioning information: CAL_VER=1.11.4, CRDS_VER=11.17.2, and CRDS_CTX=jwst_p1147.pmap.