Other
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8141r&link_type=abstract
HST Proposal ID #8141
Other
Hst Proposal Id #8141 Stellar Populations In Clusters
Scientific paper
In the course of analyzing photometry from a snapshot survey of Magellanic globular clusters, we discovered 3 clusters with apparent double turnoffs. If the fainter of the two possible turnoffs is the actual main sequence turnoff point, then the clusters would fall in the putative LMC age gap from 4 to 12 Gyr. However, our team has been reluctant to proceed with publication until better data could be obtained: we have never seen such peculiar turnoffs in any of the more than 40 Magellanic clusters we have reduced. The double turnoffs could be caused either by mergers, multiple bursts within a cluster, or a bimodal metallicity distribution. We can test other explanations, e.g. binary populations and convective overshoot. Given the very short original exposures, we are requesting 6 orbits to obtain deep, high quality photometry of these clusters in order to explain this phenomenon.
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