NOAO >   Observing Info >   Approved Programs >   2016A-0175

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Program Information for 2016A-0175


PI: Kevin Schlaufman, Carnegie Observatories, kschlaufman@jhu.edu
Address: 813 STREET, PASADENA, CA 91101 USA

CoI: Andrew Casey, University of Cambridge
CoI: Timothy Beers, U. of Notre Dame
CoI: Vinicius Placco, U. of Notre Dame

Title: An All-Sky Search for the Brightest Metal-poor Stars

Abstract: Metal-poor stars are local relics of the high-redshift Universe. The acquisition of high signal-to-noise spectra for faint metal-poor stars requires a major telescope time commitment though, making the construction of large samples of metal-poor star abundances prohibitively expensive. The HK and HES Surveys have been exhausted of their bright metal-poor star candidates, while saturation in SDSS imaging precludes its use for the identification of bright metal-poor stars. Schlaufman & Casey (2014) used the lack of molecular absorption at 4.6 microns to efficiently identify bright metal-poor stars, and we propose to observe all 310 of their candidate metal-poor stars with V < 12.5 observable in 2016A. We expect to identify more than 110 stars with [Fe/H] < -2.0. The bright metal-poor stars identified from this survey and confirmed by ground-based high-resolution spectroscopy are bright enough to be observed by HST in the ultraviolet to measure Ge, As, Se, Cd, Lu, Os, Pt, and Hg. Those abundances have the potential to break the degeneracies between different models for the chemical enrichment of metal-poor stars. The proposed observations will continue our all-sky survey that was started in 2015A, and the overall program should eventually yield more than 500 bright stars with [Fe/H] < -2.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2016A):  GEM-NQ/GMOSN -- 79.4hrs band 3 (GN-2016A-Q-75)
Run 2 (2016A):  GEM-SQ/GMOSS -- 74hrs band 3 (GS-2016A-Q-76)


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2016A-0175

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