Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-12-21
Astronomy and Astrophysics
Astrophysics
5 pages, 3 figures, to appear in the proceedings of the "XXI Century challenges for stellar evolution" workshop, Cefalu' 2007
Scientific paper
I present multiband optical and UV Hubble Space Telescope photometry of the two Galactic globular clusters NGC6388 and NGC6441, in order to investigate the nature of the physical mechanism(s) responsible for the existence of an extended blue tail and of a slope in the horizontal branch. Further evidence that the horizontal branch tilt cannot be interpreted as an effect of differential reddening is provided, while I show that a possible solution of the puzzle is to assume that a small fraction of the stellar population in the two clusters is strongly helium enriched.
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