Bellini, A; Piotto, G; Milone, Antonino; King, I R; Renzini, Alvio; Cassisi, S; Anderson, J; Bedin, L R; Nardiello, D; Pietrinferni, A; Sarajedini, A
NGC 6388 and NGC 6441 are two massive Galactic bulge globular clusters that share many properties, including the presence of an extended horizontal branch (HB), quite unexpected because of their high metal content. In this paper we use Hubble Space Telescope's WFPC2, ACS, and WFC3 images and present a broad multicolor study of their stellar content, covering all main evolutionary branches. The color-magnitude diagrams (CMDs) give compelling evidence that both clusters host at least two stellar...[Show more]
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