RGB Luminosity Functions for M2, M3, and M14

Details RGB Luminosity Functions for M2, M3, and M14 RGB Luminosity Functions for M2, M3, and M14

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21715214p&link_type=abstract

American Astronomical Society, AAS Meeting #217, #152.14; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We present new BVI wide-field photometry of M2 (NGC 7089), M3 (NGC 5272), and M14 (NGC 6402). After extensive artificial star tests to determine completeness, this photometry is then used to create red giant branch stellar luminosity functions for the clusters. Comparisons of the observed luminosity functions to model functions from the Dartmouth Stellar Evolution Program verify that the stellar evolution models accurately predict the speed of evolution on the red giant branch. Further examination using the Kolmogorov-Smirnoff test, determines the ages and distance moduli of the clusters to be 14.0±1.9 Gyr at (m-M)V =15.3 for M2, 10.3 ± 1.6 Gyr at (m-M)V = 15.2 for M3, and 13.5±1.6 Gyr at (m-M)V = 16.45 for M14. A Monte Carlo investigation of the uncertainties involved in creating and matching theoretical luminosity functions to observations suggests a 1.2 Gyr systematic uncertainty.

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