The Abundances of Open Clusters NGC 188 and NGC 6791

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

Analysis of low resolution spectra of K giants in old open clusters NGC 188 and NGC 6791 yields [Fe/H] = 0.075 +/- 0.045 for NGC 188 and [Fe/H] = 0.320 +/- 0.023 for NGC 6791. Both estimates are subject to a drift between our underlying star catalog's abundance scale and the true abundance scale, but the quoted precision of as low as 5% for abundance measurements derived from low resolution spectral indices is readily achievable given multiple measurements and reasonable signal to noise ratios. These estimates are independent of distance and dust extinction.

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