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The analysis of multiple populations (MPs) in globular clusters, bothspectroscopically and photometrically, is key in understanding their formationand evolution. The relatively narrow Johnson U, F336W, and Stromgren and Sloanu filters have been crucial in exhibiting these MPs photometrically, but inPaper I we showed that the broader Washington C filter can more efficientlydetect MPs in the test case globular cluster NGC 1851. In Paper I we alsodetected a double MS that has not been detected in previous observations of NGC1851. We now match this photometry to NGC 1851's published RGB abundances andfind the two RGB branches observed in C generally exhibit different abundancecharacteristics in a variety of elements (e.g., Ba, Na, and O) and in CN bandstrengths, but no single element can define the two RGB branches. However,simultaneously considering [Ba/Fe] or CN strengths with either [Na/Fe], [O/Fe],or CN strengths can separate the two photometric RGB branches into two distinctabundance groups. Matches of NGC 1851's published SGB and HB abundances to theWashington photometry shows consistent characterizations of the MPs, which canbe defined as an O-rich/N-normal population and an O-poor/N-rich population.Photometric synthesis for both the Washington C filter and the F336W filterfinds that these abundance characteristics, with appropriate variations in He,can reproduce for both filters the photometric observations in both the RGB andthe MS. This photometric synthesis also confirms the throughput advantages thatthe C filter has in detecting MPs.

Multiple Populations in NGC 1851: Abundance Variations and UV Photometric Synthesis in the Washington and HST/WFC3 Systems