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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 1.

A selection of example ESA Gaia CMDs (BP − RP, G) from each of the four quality categories. APOGEE/MWM calibration clusters (Qual = 4) are shown in the first row, high-quality clusters (Qual = 3) with more than five stars in the second, high-quality clusters (Qual = 2) with 2–4 stars in the third, and good clusters (Qual = 1) with only 1 star in the bottom row. The T. Cantat-Gaudin et al. (2020) ESA Gaia-identified, proper motion-selected member stars are shown as black points, OCCAM pipeline-identified MWM/APOGEE members from DR19, adding RV and [Fe/H] selection, are shown as orange stars. The blue stars are proper motion-selected member stars that the OCCAM pipeline has rejected as RV and/or [Fe/H] members. A PARSEC isochrone generated with the mean cluster [Fe/H] from OCCAM, and the distance, reddening, and age from T. Cantat-Gaudin et al. (2020) is plotted in gray. (Note: no effort has been made to adjust/refit the isochrone fit in this work.)

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