Luminosity Functions of M15

Details Luminosity Functions of M15 Luminosity Functions of M15

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21715213f&link_type=abstract

American Astronomical Society, AAS Meeting #217, #152.13; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We present new BVI observations of the Galactic globular cluster M15 obtained with the 2.4 meter Hilter telescope at the MDM Observatory under good seeing conditions. The observations cover an area 25 arcminutes square centered on the cluster. The observations have been reduced using the DAOPHOT stellar photometry package and extensive artificial star tests to produce detailed color-magnitude diagrams with over 50,000 stars and luminosity functions. The data extends from the tip of the red giant branch to several magnitudes below the main sequence turnoff. We compare the CMDs and luminosity functions to Dartmouth Stellar Evolution Program (DSEP) models. Using a metallicity of [Fe/H] = -2.10 we find an age of 13 Gyr and distance modulus of (m-M)V = 15.55.

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