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The Open Cluster Chemical Abundances and Mapping Survey. VIII. Galactic Chemical Gradient and Azimuthal Analysis from SDSS/MWM DR19

  • Authors: Jonah M. Otto, Peter M. Frinchaboy, Natalie R. Myers, James W. Johnson, John Donor, Ahabar Hossain, Szabolcs Mészáros, Hailey Wallace, Katia Cunha, Binod Bhattarai, Amaya Sinha, Gail Zasowski, Sarah R. Loebman, Alessa I. Wiggins, Adrian M. Price-Whelan, Taylor Spoo, Diogo Souto, Dmitry Bizyaev, Kaike Pan, Andrew K. Saydjari, Ying-Yi Song

Jonah M. Otto et al 2026 The Astronomical Journal 171 .

  • Provider: AAS Journals

Caption: Figure 18.

The Galactic metallicity ([Fe/H]) gradients using the full sample of reliable clusters from the E. L. Hunt & S. Reffert (2023) analysis (shown as triangles), as a function of the current Galactocentric radius (RGC; top panel (a)) and guiding center radius (RGuide; bottom panel (b)). The bilinear fit (blue lines), as well as the linear fit (choral dotted–dashed line), is shown. Fit parameters and knee locations are indicated within each panel. The color bar indicates the number of OCCAM member stars in each cluster, saturating at a value of five stars.

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