Physics – Optics
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915104c&link_type=abstract
American Astronomical Society, AAS Meeting #219, #151.04
Physics
Optics
Scientific paper
Theory suggests that young massive star clusters (YMCs) are disrupted by numerous dynamical processes and are dissolved into the stellar populations of their host galaxy. The dwarf starburst NGC 1569 contains two of the brightest, most massive young ( 10 Myr) star clusters within 5 Mpc. Previous studies of the half-light radii of these YMCs have found sizes comparable to the globular clusters in the Milky Way and the LMC. We explore the cluster boundaries by examining the relation between the young cluster stars and the ambient field population. The high spatial resolution of our Keck laser guide star adaptive optics images enables photometry of individual stars down to the confusion limit within 3 pc of the cluster core. We fit isochrones derived from Geneva evolution models to determine the age and extinction of individual stars. Preliminary results indicate the presence of high mass stars with the age of the clusters at radii of 60 to 70 pc, much larger than any nearby globular cluster. These stars act as tracers for the YMC populations, implying that the clusters are observed actively dissolving into the galactic population.
Crawford John-Paul
Graham James R.
McCrady Nate
Vacca William D.
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