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| Paper: |
Washington Photometry of the Multiple Stellar Populations in the Globular Cluster NGC 1851 |
| Volume: |
491, Fifty Years of Wide Field Studies in the Southern Hemisphere: Resolved Stellar Populations in the Galactic Bulge and the Magellanic Clouds |
| Page: |
189 |
| Authors: |
Cummings, J. D.; Geisler, D.; Villanova, S. |
| Abstract: |
The detailed analysis of multiple populations (MPs) in globular clusters (GCs), both spectroscopically
and photometrically, has become an exciting area in astronomy. Multiple red giant branches (RGBs),
subgiant branches (SGBs), and even main sequences are being observed in many GCs while broad abundance
distributions of certain elements are being detected in most, if not all, GCs. UV photometry has been
crucial in exhibiting these MPs, but the Johnson U and the Strömgren and Sloan u filters that have
previously been used are inefficient and sensitive to reddening and atmospheric extinction. Our
analysis of NGC 1851 with the broader and slightly redder Washington C filter shows to be
very effective at detecting the previously observed double RGB and SGB, but with using relatively little
telescope time. Remarkably, we have also detected a previously unobserved double main sequence (MS). |
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