NOAO > Observing Info > Approved Programs > 2013B-0019
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NOAO > Observing Info > Approved Programs > 2013B-0019 |
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PI: Timothy Beers, NOAO, beers@noao.edu
Address: 950 North Cherry Ave., Tucson, AZ 85719, USA
CoI: Vinicius Placco, Universidade de Sao Paulo
CoI: Norbert Christlieb, Universitat Heidelberg
CoI: Silvia Rossi, Universidade de Sao Paulo
CoI: Rafael Santucci, Universidade de Sao Paulo
Title: Missing metal-poor stars from the HK and Hamburg/ESO Surveys
Abstract:
The most metal-poor stars in the Galaxy retain the imprint of chemical
evolution processes that took place during the earliest epochs of the
Universe, and provide valuable kinematic probes of the hierachical assembly
of the Milky Way. We propose to supplement the lists of known very metal-poor
([Fe/H] < -2.0) stars by obtaining follow-up medium-resolution spectroscopy
of candidates selected from the HK and Hamburg/ESO prism surveys. We have
prepared a list of several thousand candidates, with 10 < B < 18, and
available at essentially all RAs in both hemispheres. We plan to use GMOS-N
and GMOS-S to obtain spectra for the fainter candidates; brighter candidates
will be acquired with other 4-m class telescopes. These medium-resolution
spectra will be used to determine atmospheric parameters (Teff, logg,
[Fe/H]), as well as estimates of [C/Fe] and [alpha/Fe] and accurate radial
velocities, using our well-tested spectroscopic analysis pipeline. This
information will enable the identification of many new very metal-poor stars,
including representatives of the inner- and outer-halo populations, for which
detailed chemodynamical analysis can be carried out. The most interesting
stars identified during this project will be selected for later follow-up
with the either existing or new high-resolution spectrographs being developed
for Gemini-N, Gemini-S, and SOAR.
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360
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NOAO > Observing Info > Approved Programs > 2013B-0019 |
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