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American Astronomical Society, Astrophysical Journal, 1(642), p. 462-469, 2006

DOI: 10.1086/500729

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The metallicity of the old open cluster NGC 6791

Journal article published in 2006 by Raffaele Gratton ORCID, Angela Bragaglia, Eugenio Carretta, Monica Tosi
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

We have observed four red clump stars in the very old and metal-rich open cluster NGC 6791 to derive its metallicity, using the high resolution spectrograph SARG mounted on the TNG. Using a spectrum synthesis technique we obtain an average value of [Fe/H] = +0.47 (+/- 0.04, rms=0.08) dex. Our method was tested on mu Leo, a well studied metal-rich field giant. We also derive average oxygen and carbon abundances for NGC 6791 from synthesis of [O I] at 6300 A and C_2 at 5086 A, finding [O/Fe] =~ -0.3 and [C/Fe] =~ -0.2. Comment: In press on ApJ