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BIBTEX RIS

NGC 6441: another indication of very high helium content in globular cluster stars

2006; EDP Sciences; Volume: 463; Issue: 3 Linguagem: Inglês

10.1051/0004-6361

ISSN

1432-0746

Autores

V. Caloi, F. D’Antona,

Tópico(s)

Astrophysics and Star Formation Studies

Resumo

Context.The metal-rich bulge globular cluster NGC 6441 shows both a well-developed blue horizontal branch (Rich et al.), and a strong slope upward from the red clump to the blue of the RR Lyrae region. The former corresponds to the well–known second parameter problem. Both features are not explained by conventional evolutionary models.

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