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The Milky Way Bulge Extratidal Star Survey: NGC 6569

  • Authors: Joanne Hughes, Andrea Kunder, Kevin Covey, Kathryn Devine, Kristen A. Larson, Carlos Campos, Adrian M. Price-Whelan, Joseph E. McEwen, Gabriel I. Perren, Christian I. Johnson, Craig Horton, Luke Smith, Sarah Torset, Cynthia Luna, Matthew Kolmanovsky, Fiona Kovisto, Leander Villarta, Vy Vuong, Iulia T. Simion, Kyle Webster, Erika Silva, Catherine A. Pilachowski, R. Michael Rich, Justin A. Kader, Andreas J. Koch-Hansen, Meridith Joyce, Sean McAdam, Faith Benda

Joanne Hughes et al 2026 The Astronomical Journal 171 .

  • Provider: AAS Journals

Caption: Figure 7.

The SP_Ace code-derived [α/Fe] versus [Fe/H] for the best extratidal candidates selected in Figure 6, Grades A+B (19 objects). The black-filled star marks NGC 6569’s mean values from high-resolution samples (see J18). The open star with error bars is the average of the N. Barrera et al. (2025) sample. Within uncertainties, candidates follow a single locus consistent with NGC 6569; we find no compelling evidence for intrinsic spreads in [Fe/H] or [α/Fe]. A few high-[α/Fe] points occur at low S/N and are treated as upper limits. The gray dots are the Besançon Galactic population models generated for our AAT FOV and PM limits.

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