Color-Magnitude Diagrams and Luminosity Functions Down to the Hydrogen-Burning Limit. III. A PreliminaryHubble Space TelescopeStudy of NGC 6791 | Zendy

Ivan R. King | Zendy; L. R. Bedin | Zendy; G. Piotto | Zendy; S. Cassisi | Zendy; Jay Anderson | Zendy

Open Access

Color-Magnitude Diagrams and Luminosity Functions Down to the Hydrogen-Burning Limit. III. A PreliminaryHubble Space TelescopeStudy of NGC 6791

Author(s) -

Ivan R. King,

L. R. Bedin,

G. Piotto,

S. Cassisi,

Jay Anderson

Publication year - 2005

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/431327

Subject(s) - physics , distance modulus , astrophysics , advanced camera for surveys , luminosity function , magnitude (astronomy) , hubble space telescope , star cluster , hertzsprung–russell diagram , open cluster , astronomy , white dwarf , luminosity , diagram , apparent magnitude , hubble deep field , hubble ultra deep field , stars , globular cluster , stellar evolution , galaxy , statistics , mathematics

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 theneighborhood of the hydrogen-burning limit.Comparison with isochrones leads toa discussion of the distance modulus, the reddening, and the age of thecluster. By making a statistical correction for field stars we derive apreliminary luminosity function, and a very tentative mass function. The whitedwarf sequence is clearly shown, and has been discussed in a separate paper.Comment: 21 pages, 8 figures. Accepted (25 April 2005) on AJ, in press for the August issu

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