Other
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.251..545h&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 251, Aug. 15, 1991, p. 545-554.
Other
42
Horizontal Branch Stars, Red Giant Stars, Star Clusters, Stellar Evolution, Astronomical Catalogs, Calibrating, Color-Magnitude Diagram, Magellanic Clouds, Milky Way Galaxy
Scientific paper
A new age indicator for star clusters and other stellar populations, with red horizontal branches or clumps, is introduced. This indicator is defined as the color difference between the median color of the red horizontal branch or clump and the red giant branch at the level of the horizontal branch. This difference is clearly independent of the values adopted for the reddening and distance modulus of the population as well as of systematic errors in the photometry, and it is shown to be insensitive to metal abundance for a wide range of metallicities from solar values down to Fe/H about -1.7 dex. The theoretical predictions of stellar evolution models for this indicator are also examined. Finally, the new indicator is applied to color-magnitude diagrams of star clusters with poorly known ages in the Galaxy, as well as to field populations in the Magellanic Clouds and the Carina dwarf spheriodal galaxy. At least one of the galactic disk globular clusters examined is found to have an age less than about 8 Gyr.
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