Colour Magnitude Diagrams of the moderately metal-rich globular clusters NGC 6569 and Palomar 11

Details Colour Magnitude Diagrams of the moderately metal-rich globular clusters NGC 6569 and Palomar 11 Colour Magnitude Diagrams of the moderately metal-rich globular clusters NGC 6569 and Palomar 11

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...374..564o&link_type=abstract

Astronomy and Astrophysics, v.374, p.564-569 (2001)

Astronomy and Astrophysics

Astrophysics

5

Galaxy: Globular Clusters: Individual: Ngc 6569, Palomar 11, Stars: Hertzsprung-Russell Diagram

Scientific paper

For the first time Colour-Magnitude Diagrams are presented for NGC 6569 and Palomar 11. NGC 6569 is a rather concentrated cluster whereas Palomar 11 is loose and sparsely populated. Cluster parameters are derived from V and I photometry. These are red Horizontal Branch globular clusters, with metallicities comparable to that of 47 Tucanae. We derive a reddening E(B-V) ~ 0.53 and a distance from the Sun dsun ~ 9.8 kpc for NGC 6569, and E(B-V) ~ 0.35 and dsun ~ 13.2 kpc for Palomar 11. NGC 6569 is located in the bulge, while Palomar 11, despite its rather high metallicity, is in the inner halo, a rare case similar to that of 47 Tucanae. Observations collected at the European Southern Observatory - ESO, Chile, proposal no. 64L-0212(A).

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