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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 10.

Metallicity gradients [Fe/H] as a function of the azimuth angle (ϕ) for four slices in RGC: (a) 5 kpc ≤ RGC ≤ 8 kpc, (b) 8 kpc < RGC ≤ 10 kpc, (c) 10 kpc < RGC ≤ 12 kpc, and (d) 12 kpc < RGC ≤ 14 kpc. The linear fits (blue solid line), derived gradients, and the number of clusters (N) used are shown in each panel. Points are colored by the cluster age in Gyr, saturating at younger than 1 Gyr and older than 5 Gyr. Fits were determined using only clusters within the azimuth angle range 150° ≤ ϕ ≤ 210°. The regions corresponding to these radial slices are shown in Figure 8.

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