Homogeneous, High-Precision Metal Abundances in Pleiades K Dwarfs

Details Homogeneous, High-Precision Metal Abundances in Pleiades K Dwarfs Homogeneous, High-Precision Metal Abundances in Pleiades K Dwarfs

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001noao.prop..298k&link_type=abstract

NOAO Proposal ID #2001B-0298

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Scientific paper

Despite their implications for stellar structure, Galactic chemical evolution, and (possibly) circumstellar chemistry, abundance determinations of a variety of elements in open cluster stars are virtually non-existent. One notable exception is existing observations of Li abundances in the Pleiades open cluster which show apparent huge dispersion- the definitive source of which remains a fundamental challenge for stellar evolution theory and may have significant implications for stellar models. Ironically, a potential limitation in our attempts to understand Pleiades lithium abundances is the lack of detailed abundances of other elements in these same stars. We propose to obtain high resolution (R=60,000) and high S/N (⪆150) spectroscopy of 22 Pleiads within the narrow spectral type range K2-K3. These data will be used to determine abundances of O, K, Mg, Al, Ca, Fe, and other elements in these young (100 Myr) stars. Our goals are to use these abundances to revisit the apparent Pleiades Li dispersion employing a homogeneous uniformly high quality data set by a) determining if Li dispersion is correlated with apparent dispersion in the abundances of other elements b) following up a recent claim that some Pleiads may be anomalously deficient in Al and other low ionization potential elements c) searching for evidence of Li variability by comparing our data with previous (usually lower quality) Li line strength measures, and d) using detailed metal abundances (not values simply scaled with [Fe/H]) to constrain the metallicity sensitive expected amount of standard PMS Li burning suffered by Pleiads. The High Resolution Spectrograph on the HET is well- and near- uniquely suited to simultaneously obtain the desired high resolution, high S/N, and large wavelength coverage in a large sample of Pleiads in a reasonable amount (~13 hours) of time.

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