NOAO >   Observing Info >   Approved Programs >   2014A-0147

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Proposal Information for 2014A-0147


PI: Catherine Pilachowski, Indiana University, catyp@astro.indiana.edu
Address: Astronomy Department, 727 E 3rd St, Bloomington, IN 47405, USA

CoI: Kristie Nault, Indiana University Bloomington

Title: The Abundance of Fluorine in the Galactic Halo

Abstract: Observations of the abundance of fluorine in metal-poor field and globular cluster giants with Phoenix on the Mayall 4-m telescope will allow us to compare the chemical evolution of fluorine in three broad Galactic stellar populations: the thin disk, the thick disk, and the halo. From these data along with sodium and oxygen abundances, we can explore mechanisms for the origin of fluorine and the time scale of its production. Information on the abundance of fluorine in normal stars is remarkably sparse. While enhancements of the element in AGB stars clearly indicate that fluorine is produced \emphin situ during double- shell burning, the relative contribution of AGB stars to the Galactic fluorine abundance may be modest compared to the contributions from supernovae (and possibly Wolf-Rayet stars).


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NOAO >   Observing Info >   Approved Programs >   2014A-0147

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