Color--Magnitude Diagrams and Luminosity Functions down to the Hydrogen Burning Limit. III. A Preliminary HST Study of NGC6791

Abstract

Using HST ACS/WFC 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 function. The white dwarf sequence is clearly shown, and has been discussed in a separate paper.

arXiv comment21 pages, 8 figures. Accepted (25 April 2005) on AJ, in press for the August issue

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Cited by in corpus (41)

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• NGC 6791: an exotic open cluster or the nucleus of a tidally disrupted galaxy?
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• Reaching the End of the White Dwarf Cooling Sequence in NGC 6791
• The chemical abundance of the very metal rich old Open Clusters NGC 6253 and NGC 6791
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• Sodium and Oxygen Abundances in the Open Cluster NGC 6791 from APOGEE H-Band Spectroscopy
• The Puzzling White Dwarf Cooling Sequence in NGC6791: A Simple Solution
• Searching for Chemical Signatures of Multiple Stellar Populations in the Old, Massive Open Cluster NGC 6791
• A New Look at the Old Star Cluster NGC 6791
• Evidence of tidal distortions and mass loss from the old open cluster NGC 6791
• Element abundances in the metal rich open cluster NGC6253
• The absolute motion of the peculiar cluster NGC6791
• Nonlinear seismic scaling relations
• Variable stars in the open cluster NGC 6791 and its surrounding field
• White Dwarfs in NGC 6791: Avoiding the Helium Flash
• Abundances in Turn-off Stars in the Old, Metal-Rich Open Cluster, NGC 6791
• A new search for planet transits in NGC 6791
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• The Helium Abundance of NGC 6791 from Modeling of Stellar Oscillations
• Diameters of Open Star Clusters
• Asteroseismic Study on Cluster Distance Moduli for RGB Stars in NGC 6791 and NGC 6819
• The Old, Super-Metal-Rich Open Cluster, NGC 6791 - Elemental Abundances in Turn-off Stars from Keck/HIRES Spectra
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