The Peculiar Horizontal Branch Morphology of the Galactic Globular Clusters NGC6388 and NGC6441

Details The Peculiar Horizontal Branch Morphology of the Galactic Globular Clusters NGC6388 and NGC6441 The Peculiar Horizontal Branch Morphology of the Galactic Globular Clusters NGC6388 and NGC6441

2007-12-21

arxiv.org/abs/0712.3720v1

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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