Physics – Optics
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21534003m&link_type=abstract
American Astronomical Society, AAS Meeting #215, #340.03; Bulletin of the American Astronomical Society, Vol. 42, p.445
Physics
Optics
Scientific paper
We examine the evolution of asymptotic giant branch (AGB) and red giant branch stars in color magnitude space as a function of metallicity and age in 7 intermediate age clusters from M33 and M31. Spectroscopy of these clusters suggests that they span an age range from 1 - 9 Gyrs and metallicities from solar to below 1/10th solar. High spatial resolution (0.05") near-IR images of the clusters were obtained with Keck adaptive optics and matched to optical images from HST. We determine the fraction of IR luminosity arising from the IR luminous thermally-pulsing AGB stars, an important constraint for measuring stellar masses of high redshift galaxies. We also explore methods for determining the age, metallicity, and metallicity spread of the clusters based on the near-IR photometry alone, specifically from the color, magnitude, and width of the tip of the RGB.
Chandar Rupali
Melbourne Jason
Olsen Kasper
Puzia Thomas H.
Williams Bruce
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