Next-Generation Targets for New-Generation Telescopes: Finding the Most Metal-Poor Stars in the Galaxy

Details Next-Generation Targets for New-Generation Telescopes: Finding the Most Metal-Poor Stars in the Galaxy Next-Generation Targets for New-Generation Telescopes: Finding the Most Metal-Poor Stars in the Galaxy

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...196.3509b&link_type=abstract

American Astronomical Society, 196th AAS Meeting, #35.09; Bulletin of the American Astronomical Society, Vol. 32, p.729

Astronomy and Astrophysics

Astronomy

1

Scientific paper

High-resolution spectrographs on 8m-class telescopes will be prodigious consumers of photons generated by the most metal-deficient stars in the Galaxy, assuming they (the telescopes, not the photons) can be told where to look. I summarize the results of 20 years of the HK (originally referred to as the Preston-Shectman) survey effort, which has identified over 90% of all of the stars presently known with [Fe/H] < -2.5 (N ~ 350) , i.e., with metallicites less than the lowest abundance globular clusters. I then discuss a new, and far more efficient, approach to the discovery of extremely metal-poor stars, making use of the stellar component of the Hamburg/ESO Survey (HES) of the southern sky. A new, accelerated, survey effort based on 4m-class follow-up observations of candidate metal-poor stars from the HES should be able to identify ~ 1500 stars with [Fe/H] < -2.5 in three years time, and will be described in detail. If future users of HROS on Gemini South wish to have interesting (low-metallicity) targets to examine, NOW is the time to find them. Partial support from the NSF, via grant AST95-29454, for recent work, is gratefully acknowledged. I would be pleased to acknowledge support from the NSF to carry out the future efforts described herein, should it be received.

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