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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 9.

Metallicity gradients ([Fe/H]) as a function of the Galactocentric radius (RGC) for five slices in azimuth angle (ϕ): (a) 150° ≤ ϕ ≤ 165°, (b) 165° < ϕ ≤ 175°, (c) 175° < ϕ ≤ 185°, (d) 185° < ϕ ≤ 195°, and (e) 195° < ϕ ≤ 210°. Points are colored by the cluster age in Gyr, saturating at younger than 1 Gyr and older than 5 Gyr. The linear fits (blue lines), derived gradients, and number of clusters (N) used are shown in each panel. Fits were determined using only the clusters with 5 kpc ≤ RGC ≤ 14 kpc. The regions corresponding to these azimuth slices are shown on an X–Y plot in Figure 8.

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