NOAO >   Observing Info >   Approved Programs >   2003B-0323

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Proposal Information for 2003B-0323


PI: Kenneth Hinkle, NOAO, hinkle@noao.edu
Address: NGSC, P.O. Box 26732, Tucson, AZ 86726, USA

CoI: Katia Cunha, Observatorio Nacional Brazil
CoI: Verne Smith, University of Texas El Paso

Title: The Origin of Fluorine

Abstract: The astrophysical origin of fluorine is not understood. Three possible sources, involving core collapse supernovae, high-mass stars, and low-mass stars, have been discussed. Atomic fluorine is difficult to observe because the transitions are in the ultraviolet. All astronomical abundances come from observation of the molecule HF, limiting previous determinations of the fluorine abundance to evolved cool stars and for the sun, sunspots. We propose to determine for the first time the fluorine abundance in dwarf stars other than the sun. Abundances of fluorine and oxygen will be measured in a sample of field M dwarfs. The dwarfs range in metalicity from [m/H] ~ -2 to 0. By determining the oxygen and fluorine abundances in dwarfs and by comparing these to model predictions and literature values for fluorine in evolved stars we should be able to establish the source of this element.


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