NOAO >   Observing Info >   Approved Programs >   2010B-0541

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Proposal Information for 2010B-0541


PI: Ronald Wilhelm, University of Kentucky, ron.wilhelm@uky.edu
Address: Physics Department, 700 Rose Street, Lexington, KY 40506-0055, USA

CoI: Justin Adkins, University of Kentucky
CoI: Syed Uddin, University of Kentucky

Title: Exploring Chemically Peculiar A/F-type Stars at Low Galactic Latitudes

Abstract: This observing proposal is for three nights of time using the Hydra and Bench spectrograph on the WIYN 3.5m telescope to observe chemically peculiar (CP) A/F-type stars in the Monoceros stream. These stars, which were initial identified using data from the SDSS/SEGUE surveys, show clear depletion of calcium relative to iron. Preliminary analysis of brighter stars with high SNR spectra from our total CP sample, indicate that the CaIIK line is to early for the stars' hydrogen and iron spectral type. This could be due to photospheric diffusion effects as seen in metallic-line A-stars, or could be a true primordial alpha-element deficiency. The highest percentage of CP stars appear to be spatially and kinematically consistent with membership in the Monoceros stream. Our goal is to obtain high SNR spectroscopy to further investigate the chemical abundance and luminosity signatures in order to determine the true nature of these CP stars.


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NOAO >   Observing Info >   Approved Programs >   2010B-0541

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