Faint M4 stars observed with JWST are redder than models predict, suggesting a roughly 0.5 dex oxygen deficit in the lower main sequence, with tentative brown dwarf candidates down to about 1000 K.
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JWST Imaging of the Closest Globular Clusters -- VI. The Lowest-Mass Objects in M 4 and the Galactic Bulge
Faint M4 stars observed with JWST are redder than models predict, suggesting a roughly 0.5 dex oxygen deficit in the lower main sequence, with tentative brown dwarf candidates down to about 1000 K.