Globular cluster ages revisited - The case of Ruprecht 106

Details Globular cluster ages revisited - The case of Ruprecht 106 Globular cluster ages revisited - The case of Ruprecht 106

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105..184b&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 105, no. 1, p. 184-208.

Other

70

Color-Magnitude Diagram, Galactic Halos, Globular Clusters, Magellanic Clouds, Stellar Evolution, Horizontal Branch Stars, Metallicity, Milky Way Galaxy, Stellar Models

Scientific paper

Further strong evidence is presented that the Galactic globular cluster Ruprecht 106 is 'metal-poor and young', implying a delayed (about 4-5 Gyr) cluster formation within the Galactic Halo, unless it was captured from the Magellanic Clouds or other Galactic satellites. Moreover, alpha-enhanced evolutionary stellar models are necessary to explain several observed features in the color-magnitude diagram (CMD) of Ruprecht 106, in particular its red horizontal branch. Such models are necessary to yield a global self-consistency between the CMD observables and the determinations of metallicity, and age. If confirmed, this result may imply that the ages of Galactic globular clusters determined using models where only O-enhancement is taken into account should be regarded with caution.

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