Survey for Transiting Extrasolar Planets in Stellar Systems. II. Spectrophotometry and Metallicities of Open Clusters

Abstract

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 \pm0.08 dex. We derive the following metallicities for the seven open clusters: NGC 1245, [m/H]=-0.14\pm0.04; NGC 2099, [m/H]=+0.05\pm0.05; NGC 2324, [m/H]=-0.06\pm0.04; NGC 2539, [m/H]=-0.04\pm0.03; NGC 2682 (M67), [m/H]=-0.05\pm0.02; NGC 6705, [m/H]=+0.14\pm0.08; NGC 6819, [m/H]=-0.07\pm0.12. These metallicity estimates will be useful in planning future extra-solar planet transit searches since planets may form more readily in metal-rich environments.

38 pages, including 12 figures. Accepted for publication in AJ

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• When Do Stalled Stars Resume Spinning Down? Advancing Gyrochronology with Ruprecht 147
• On the metallicity of open clusters II. Spectroscopy
• A new detailed examination of white dwarfs in NGC3532 and NGC2287
• Deep MMT Transit Survey of the Open Cluster M37 I: Observations and Cluster Parameters
• Primordial Binary Evolution and Blue Stragglers
• Planets in Stellar Clusters Extensive Search. IV. A detection of a possible transiting planet candidate in the open cluster NGC 2158
• Blue Straggler Stars in Galactic Open Clusters and the Simple Stellar Population Model
• Signature of a chemical spread in the open cluster M37
• Modeling blue stragglers in young clusters