2005/06/29 by J. L. Marshall, Christopher J. Burke, D. L. DePoy +2 · 20 citations
Physics and Astronomy · #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Astrophysics and Star Formation Studies #Exoplanet #Metallicity #Open cluster #Physics #Planet #Star cluster #Stars #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1086/432685
published in The Astronomical Journal 130(4), 1916-1928 (Institute of Physics) · 38 pages, including 12 figures. Accepted for publication in AJ
arxiv created 2005/06/29 · openalex publication_date 2005/09/21 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We present metallicity estimates for seven open clusters based on spectrophotometric indices from moderate-resolution spectroscopy. Observations of field giants of known metallicity provide a correlation between the spectroscopic indices and the metallicity of open cluster giants. We use χ 2 analysis to fit the relation of spectrophotometric indices to metallicity in field giants. The resulting function allows an estimate of the target-cluster giants' metallicities with an error in the method of ±0.08 dex. We derive the following metallicities for the seven open clusters: NGC 1245, [M/H] = -0.14 ± 0.04; NGC 2099, [M/H] = +0.05 ± 0.05; NGC 2324, [M/H] = -0.06 ± 0.04; NGC 2539, [M/H] = -0.04 ± 0.03; NGC 2682 (M67), [M/H] = -0.05 ± 0.02; NGC 6705, [M/H] = +0.14 ± 0.08; NGC 6819, [M/H] = -0.07 ± 0.12. These metallicity estimates will be useful in planning future extrasolar planet transit searches, since planets may form more readily in metal-rich environments.