AAS 205th Meeting, 9-13 January 2005
Session 52 Stellar Atmospheres, Abundances and Opacities
Poster, Tuesday, January 11, 2005, 9:20am-6:30pm, Exhibit Hall

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[52.11] Chemical Abundances in Field AF stars

E. Schmidt (Carthage College and NOAO), J. W. Glaspey (NOAO), P. B. Stetson (Herzberg Institute of Astrophysics)

High disperion spectra have been obtained with the GECKO spectrograph on the CFHT to determined chemical abundances. Stars were selected from lists of high-velocity stars compiled by Stetson. Preliminary results show that all are metal weak and have rotational velocities that range from nearly zero to over 40 km/s.

Abundances were determined by computing synthetic spectra using the SPECTRUM code provided by R. O. Gray (Appalachian State Univ.) for a range of abundances, effective temperatures (Teff) and surface gravities (log g). Equivalent widths were measured using the same IRAF tasks as were used on the observed stellar data. Teff and log g's were estimated from published uvby-Beta photometry. While the high resolution data allow precise measurements of parameters for the lines covered, additional spectra at moderate dispersion will be needed to measure a larger sample of lines for each chemical species.

E. Schmidt's work was funded by an NSF grant to NOAO for Research Experiences for Undergraduates.

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