Blue horizontal branch stars in metal-rich globular clusters. I. NGC 6388 and NGC 6441

Details Blue horizontal branch stars in metal-rich globular clusters. I. NGC 6388 and NGC 6441 Blue horizontal branch stars in metal-rich globular clusters. I. NGC 6388 and NGC 6441

1999-09-16

arxiv.org/abs/astro-ph/9909289v1

Astronomy and Astrophysics

Astrophysics

8 pages, 3 figures, LaTeX, aa.cls included, accepted for publication in A&A

Scientific paper

We report the first results of an ongoing spectroscopic survey of blue horizontal branch stars in the metal-rich ([Fe/H] ~ -0.5) globular clusters NGC 6388 and NGC 6441. Based on data obtained with the ESO-New Technology Telescope (NTT), we provide gravities and temperatures for four stars in NGC 6388 and three stars in NGC 6441. These results are marginally inconsistent with the predictions of canonical evolutionary theory, but disagree strongly with all non-canonical scenarios that explain the sloped horizontal branches seen in the colour-magnitude diagrams of these clusters.

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