The WFC3 Galactic Bulge Treasury Program: Metallicity Estimates for the Stellar Population and Exoplanet Hosts

  title={The WFC3 Galactic Bulge Treasury Program: Metallicity Estimates for the Stellar Population and Exoplanet Hosts},
  author={Thomas M. Brown and Kailash C. Sahu and Jay Anderson and Jason Tumlinson and Jeff A. Valenti and Ed Smith and Elizabeth J. Jeffery and Alvio Renzini and Manuela Zoccali and Henry C. Ferguson and Don A. VandenBerg and Howard E. Bond and Stefano Casertano and Elena Valenti and Dante Minniti and Mario Livio and Nino Panagia},
  journal={The Astrophysical Journal},
We present new UV-to-IR stellar photometry of four low-extinction windows in the Galactic bulge, obtained with the Wide Field Camera 3 on the Hubble Space Telescope (HST). Using our five bandpasses, we have defined reddening-free photometric indices sensitive to stellar effective temperature and metallicity. We find that the bulge populations resemble those formed via classical dissipative collapse: each field is dominated by an old (~10 Gyr) population exhibiting a wide metallicity range (–1.5… Expand

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