The Metallicity of the Old Open Cluster NGC 6791 | Zendy

R. Gratton | Zendy; A. Bragaglia | Zendy; E. Carretta | Zendy; M. Tosi | Zendy

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The Metallicity of the Old Open Cluster NGC 6791

Author(s) -

R. Gratton,

A. Bragaglia,

E. Carretta,

M. Tosi

Publication year - 2006

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/500729

Subject(s) - metallicity , open cluster , physics , astrophysics , spectrograph , stars , star cluster , astronomy , spectral line

We have observed four red clump stars in the very old and metal-rich opencluster NGC 6791 to derive its metallicity, using the high resolutionspectrograph SARG mounted on the TNG. Using a spectrum synthesis technique weobtain an average value of [Fe/H] = +0.47 (+/- 0.04, rms=0.08) dex. Our methodwas tested on mu Leo, a well studied metal-rich field giant. We also deriveaverage oxygen and carbon abundances for NGC 6791 from synthesis of [O I] at6300 A and C_2 at 5086 A, finding [O/Fe] =~ -0.3 and [C/Fe] =~ -0.2.Comment: In press on Ap

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