Color-Magnitude Diagrams and Luminosity Functions Down to the Hydrogen-Burning Limit. III. A Preliminary Hubble Space Telescope Study of NGC 6791

@article{King2005ColorMagnitudeDA,
  title={Color-Magnitude Diagrams and Luminosity Functions Down to the Hydrogen-Burning Limit. III. A Preliminary Hubble Space Telescope Study of NGC 6791},
  author={Ivan R. King and Luigi R. Bedin and Giampaolo Piotto and Santi Cassisi and Jefe Seattle and E.S.O.-Garching and Univ.PD and INAF-Obs.Teramo and Rice Univ. Houston},
  journal={The Astronomical Journal},
  year={2005},
  volume={130},
  pages={626-634}
}
Using Hubble Space Telescope Advanced Camera for Surveys Wide Field Channel images, we derive the color-magnitude diagram of the old, metal-rich open cluster NGC 6791 to nearly 29th magnitude in V, which is the neighborhood of the hydrogen-burning limit. Comparison with isochrones leads to a discussion of the distance modulus, the reddening, and the age of the cluster. By making a statistical correction for field stars, we derive a preliminary luminosity function and a very tentative mass… 

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