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The WFC3 Galactic Bulge Treasury Program: Metallicity Estimates for the Stellar Population and Exoplanet Hosts
Thomas M. Brown, Kailash Sahu, Jay Anderson +14
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 ou…
Fiducial Stellar Population Sequences for the VJKs Photometric System
Crystal Brasseur, Peter B. Stetson, Don A. VandenBerg +3
We have obtained broad-band near-infrared photometry for seven Galactic star clusters (M92, M15, M13, M5, NGC1851, M71 and NGC6791) using the WIRCam wide-field imager on the Canada…
An Examination of Recent Transformations to the BV(RI)_C Photometric System from the Perspective of Stellar Models for Old Stars
Don A. VandenBerg, Luca Casagrande, Peter B. Stetson
Isochrones for ages > 4 Gyr and metallicities in the range -2.5 < [Fe/H] < +0.3 that take the diffusion of helium and recent advances in stellar physics into account are compared w…
M67-1194, an unusually Sun-like solar twin in M67
Anna Önehag, Andreas Korn, Bengt Gustafsson +2
The rich open cluster M67 is known to have a chemical composition close to solar, and an age around 4Gyr. It thus offers the opportunity to check our understanding of the physics a…