The Field population towards NGC 6553

Details The Field population towards NGC 6553 The Field population towards NGC 6553

2001-11-07

arxiv.org/abs/astro-ph/0111149v1

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures, AA accepted

Scientific paper

We analyze the colour magnitude diagram of the field population in the direction of the bulge cluster NGC 6553 to discuss the stellar field component projected towards the cluster. In particular we investigate the nature of a peculiar feature, called ``red flare'' which appears as a faint turnoff, located 2 magnitudes about below the turnoff of the cluster, with a sparse trace of a sub-giant branch just above. A detailed modeling shows that the red flare is consistent with the expected location of the turnoff and sub-giant branch of the bulge population, once that the appropriate metallicity range and spatial distribution of the bulge stars are adopted. From the data, hints can be derived about the spatial shape and the basic stellar parameters of the bulge.

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