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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 4.

(a) A map of the R.A. versus decl. positions of the 303 spectroscopic targets (two fibers did not yield measurable spectra) in and around NGC 6569 (shaded circles), along with some known RRL stars (OGLE) with cataloged RVs (filled triangles). The circles are color-coded by RV (see color bar on the right). The 100 objects from J18 are shown as green crosses in the cluster center. The gray circles are successive tidal radii (S. Ortolani et al. 2001; E. Valenti et al. 2011, 6﹩\mathop{.}\limits^{^{\prime} }﹩9 ) from the center of NGC 6569. We choose our search limit as −25 > RV > −65 km s−1, yielding 58 objects (black-edged green circles with black pluses). (b) The relative number of stars per bin is shown in this histogram of the cluster’s RV range yielded by J18, from −30 > RV > −63 km s−1. The 100 stars from J18 were added to our 303 targets to find the cluster (green bars). The AAT sample only is shown as the black line (no shading). The Besançon Galactic population models for our FOV and PM limits are seen in mauve.

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