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We present new UV observations for NGC288, taken with the WFC3 detector onboard the Hubble Space Telescope, and combine them with existing optical datafrom the archive to explore the multiple-population phenomenon in this globularcluster (GC). The WFC3's UV filters have demonstrated an uncanny ability todistinguish multiple populations along all photometric sequences in GCs, thanksto their exquisite sensitivity to the atmospheric changes that are tell-talesigns of second-generation enrichment. Optical filters, on the other hand, aremore sensitive to stellar-structure changes related to helium enhancement. Bycombining both UV and optical data we can measure helium variation. We quantifythis enhancement for NGC288 and find that its variation is typical of what wehave come to expect in other clusters.

Multi-wavelength Hubble Space Telescope photometry of stellar populations in NGC288