AAS 201st Meeting, January, 2003
Session 44. Galactic Open Clusters and Their Contents
Poster, Tuesday, January 7, 2003, 9:20am-6:30pm, Exhibit Hall AB

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[44.01] The Chemical Composition of the Hyades

A. M. Boesgaard (U. Hawaii), J. L. Beard (Virginia Tech), J. R. King (UNLV)

The enrichment of various chemical elements with time in the Galaxy reveals the history of massive star formation and the production of supernovae. We have embarked on a study of elemental abundances in unevolved G stars in star clusters of a range in age to trace the evolution and mixing in the galactic disk.

We have obtained Keck/HIRES spectra of 17 Hyades stars with temperatures between 5000 and 6200 K and high signal-to-noise ratios (typically 500 - 700) in order to determine chemical abundances of G dwarfs in this 700 Myr old cluster. The spectra cover 5700 - 8100 A with some inter-order gaps. We have redetermined Fe and Li abundances and find good agreement with earlier results. Abundances for O and C and some other alpha-elements have been found as well as abundances of other light elements, Fe-peak elements, and rare earth elements. We compare the Hyades results with those from the old open cluster, M67. The Hyades at 700 Myr is metal-rich with [Fe/H] = +0.16 while M67 at 4.5 Gyr has solar metallicity of -0.04. Compared to M67, the Hyades has somewhat larger enhancements of C and O.

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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.