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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 1.

(a) The 18,180 objects within a radius of 30﹩^{\prime} ﹩ of the cluster center, at R.A. = 273﹩\mathop{.}\limits^{\unicode{x000b0}}﹩412000, decl. = –31﹩\mathop{.}\limits^{\unicode{x000b0}}﹩826444 with BDBS i-band measurements between 10.4 and 19.8 mag., overlaid on a variable extinction map (I. T. Simion et al. 2017; J. A. Kader et al. 2023) in the BDBS i band. (b) Gaia DR3 sources were queried from gaiadr3.gaia_source around the SIMBAD center of NGC 6569 and filtered to have measured proper motions, G  <  19, and RUWE < 1.4. Three subsets are shown: (i) an inner ﹩{5}^{{\prime} \rm{}\,\rm{}\,}﹩ circle around the cluster center (“cluster”; blue points), (ii) a ﹩1{5}^{{\prime} \rm{}\,\rm{}\,}﹩–﹩6{0}^{{\prime} \rm{}\,\rm{}\,}﹩ annulus (“bulge/field”; gray density histogram, randomly subsampled to 1.2 × 105 rows via random_index for speed), and (iii) a ﹩{2}^{{\prime} \rm{}\,\rm{}\,}﹩ core used only to estimate the cluster’s mean motion. The green star marks the median cluster proper motion from the ﹩{2}^{{\prime} \rm{}\,\rm{}\,}﹩ core. Tiny black dots show proper motions from our BDBS catalog overplotted on the same axes. Axes are ﹩{\mu }_{\alpha * }\equiv d\alpha /dt\cos \delta ﹩ versus μδ, in mas yr−1. No parallax or CMD cleaning is applied here, so the ﹩{5}^{{\prime} \rm{}\,\rm{}\,}﹩ (blue) selection includes some field contaminants.

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