Stroemgren photometry of the Bulge: the Baade's Window and the globular cluster NGC 6522

Details Stroemgren photometry of the Bulge: the Baade's Window and the globular cluster NGC 6522 Stroemgren photometry of the Bulge: the Baade's Window and the globular cluster NGC 6522

2011-10-28

arxiv.org/abs/1110.6344v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Proceeding of the RIA Workshop on Gaia "Stellar Clusters & Associations", Granada, May 23-27, 2011

Scientific paper

We present Ca-uvby Stroemgren photometry of the Baade's Window, including the Galactic globular cluster NGC 6522. We separate field and cluster stars by adopting color-color planes and proper motions. We then estimate the global metallicity of red-giants (RGs) in NGC 6522 by using a new theoretical metallicity calibration of the Stroemgren index hk presented in Calamida et al. (2011). We find that metallicities estimated by adopting the hk index and the (Ca-y) color are systematically more metal-rich than metallicities estimated with hk and the (u-y), (v-y) and (b-y) colors. Current evidence indicate that the hk metallicity index is affected not only by the Calcium abundance, but also by another source of opacity.

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