Exploring Star Clusters Using Stromgren uvby Photometry

Details Exploring Star Clusters Using Stromgren uvby Photometry Exploring Star Clusters Using Stromgren uvby Photometry

1999-09-27

arxiv.org/abs/astro-ph/9909447v1

Astronomy and Astrophysics

Astrophysics

6 pages, 3 figures, to appear in the proceedings of: "The Galactic Halo: from Globular Clusters to Field Stars"; 35'th Liege I

Scientific paper

We illustrate the application of high precision Stromgren uvby photometry to open and globular clusters (GCs). It is shown how such data can be used to determine cluster ages, independent of distance and only weakly dependent on reddening. We also illustrate in detail how c1 index variations point to significant star-to-star abundance variations of C and N (through variations in the strength of the 3360AA NH band) on the red giant branches (RGBs) of all metal-poor GCs observed to date as well as on the main sequences of M71 (NGC 6838) and 47 Tuc (NGC 104).

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