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An HST Wide-field Survey of the Galactic Bulge: Overview, Strategy, and First Results

  • Authors: Sean K. Terry, Jay Anderson, Charles A. Beichman, David P. Bennett, Aparna Bhattacharya, Jean-Philippe Beaulieu, B. Scott Gaudi, Joel Green, Macy J. Huston, Jessica R. Lu, Ray A. Lucas, David M. Nataf, Matthew T. Penny, Natalia E. Rektsini, Carolina Rodriguez Sanchez-Vahamonde, Aikaterini Vandorou

Sean K. Terry et al 2026 The Astrophysical Journal Letters 1003 .

  • Provider: AAS Journals

Caption: Figure 6.

Left panel: CMDs from four HST/WFC3 fields observed early in the survey. The field HD70 (orange points) was observed in a lower-extinction area of the footprint (see Figure 1). Field HD98 (red points) was observed at a higher-extinction sight line, closer to the galactic midplane. The variation (gradient) in extinction and reddening is apparent between the fields. Right panel: CMD for the field HD138 (blue points), with 2202 matched Gaia DR3 stars colored by Gaia G-band magnitude.

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