NOAO >   Observing Info >   Approved Programs >   2015A-0405

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Program Information for 2015A-0405


PI: Catherine A Pilachowski, Indiana U., catyp@astro.indiana.edu
Address: Astronomy Department, 727 E 3rd Street, Bloomington, IN 47405 USA

CoI: Christian I Johnson, UCLA

Title: Exploring Stellar Populations in the Galactic Bulge

Abstract: We propose to study the stellar populations of the northern Bulge using the CN red system with pODI. We request two nights when pODI is available to obtain observations of one or two fields in the northern Bulge. We will use the existing Mosaic 815 filter (similar to the Wing 8120 filter) along with the Sloan g and i filters. Bulge giants will be analyzed using photometry of individual stars through using an i-815 vs g-i diagram. The fields selected will be coincident with the northern fields observed with Hydra by Johnson et al. (2013, ApJ, 765, 157). They found a full range in metallicity spanning [Fe/H] from -1.5 to +0.5, and that the median [Fe/H] declines with increasing Galactic latitude at something like a few tenths of a dex kpc-1. Stars with [Fe/H] = -0.5 are alpha-enhanced, and the [alpha/Fe] ratios decline at higher metallicity. The pODI observations will permit us to explore variations in CN among the observed Bulge populations.

Program Type: ITAC

Scheduled Nights:
Run 1 (2015A):  WIYN/pODI -- 2n on Jul 19 - Jul 20 2015


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NOAO >   Observing Info >   Approved Programs >   2015A-0405

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