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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 2.

The BDBS differentially dereddened CMD for i0 versus (u − i)0 is shown. The small, gray-filled circles are the stars within 1﹩\mathop{.}\limits^{^{\prime} }﹩2 of the center of NGC 6569. The following objects are identified within 5 tidal radii of the center of the cluster: stars within 0﹩\mathop{.}\limits^{\unicode{x000b0}}﹩95 of the cluster center; stars must have a PM within 1 mas yr−1 in R.A. and within 1.5 mas yr−1 in decl. of the main cluster PM: a box drawn between (∼–4.125 ± 1.0 mas yr−1, ∼–7.354 ± 1.5 mas yr−1). Additional constraints were applied: objects with BDBS u magnitudes with uncertainties <0.04 mag.  were selected if they had detections in the BDBS g and i bands also. The red open squares were identified as targets for AAT/AAOmega spectroscopy. Blue triangles are flagged as likely foreground objects, and black-filled squares are identified as RRLs. The isochrone shown is from the MIST models (J. Choi et al. 2016), [Fe/H] = –0.75 dex, scaled for [α/Fe] = +0.3 dex external to MIST, with an age of 13 Gyr.

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