NOAO >   Observing Info >   Approved Programs >   2011A-0276

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Proposal Information for 2011A-0276


PI: Ryan M. Maderak, Indiana University, maderak@astro.indiana.edu
Address: Astronomy Department, Swain West 319, 727 E 3rd St., Bloomington, IN 47405-7105, USA

CoI: Constantine P. Deliyannis, Indiana University
CoI: Andrew Szentgyorgyi, CfA

Title: Testing the Oxygen vs. Age Relationship in Old Open Clusters: M67 and NGC 188

Abstract: The Galactic [O/H] versus age and [O/Fe] versus [Fe/H] relationships are of great importance for our understanding of Galactic chemical evolution. Although important questions persist at the most metal-poor end of field star studies ([Fe/H] < -2), two intriguing issues have emerged from studies of \textitopen clusters: (1) a strong O versus age relationship has been reported, and (2) in sharp contrast to field star data, open clusters show \textitno robust correlation of O to Fe. Whereas field stars do not generally allow exploration of the age parameter, open clusters can uniquely provide accurate knowledge of both age and [Fe/H]. However, previous studies have been limited by range in [Fe/H] and by sample size. We propose to test the reality of the above intriguing results by further extending our WIYN/Hydra and MMT/Hectochelle sample to two old open clusters, M67 (4.3 Gyr) and NGC 188 (7.1 Gyr), giving us the critical means to test the chemical evolution of oxygen in a wide and well sampled age range.


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