NOAO >   Observing Info >   Approved Programs >   2018A-0428

Small NOAO Logo

Program Information for 2018A-0428


PI: John J Salzer, Indiana U., slaz@astro.indiana.edu
Address: Department of Astronomy, 319 Swain West, Bloomington, IN, 47405 USA

CoI: Danielle Berg, U. of Wisconsin, Milwaukee
CoI: Erik Aver, Gonzaga University
CoI: Evan Skillman, U. of Minnesota

Title: Using NIR Spectroscopy to Derive a More Precise Estimate of the Primordial Helium Abundance

Abstract: We propose to use the LBT and LUCI infrared spectrographs to observe two of the most metal-poor galaxies known in the local universe: AGC 198691 and DDO 68. Our objective is to measure the HeI 10830A line in both objects. When used in combination with our existing high-quality optical spectral data, these new NIR observations will result in the determination of the He/H abundances for these two galaxies with unprecedented accuracy. These new abundances will lead to a dramatic improvement in the measurement of the primordial helium abundance (Y_p). An accurate measurement of Y_p provides the best test of the concordance between the standard big bang nucleosynthesis model and the analysis of cosmic microwave background observations.

Program Type: Standard/Extragalactic

Scheduled Nights:
Run 1 (2018A):  LBT-SVC/LUCI -- 5hrs


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 >   2018A-0428

noaoprop-help@noao.edu

Small NOAO Logo