The Stellar Initial Mass Function of Globular Clusters

Details The Stellar Initial Mass Function of Globular Clusters The Stellar Initial Mass Function of Globular Clusters

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8124p&link_type=abstract

HST Proposal ID #8124

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Hst Proposal Id #8124 Stellar Populations In Clusters

Scientific paper

Knowledge of star formation in old populations is a vital ingredient in understanding galactic evolution. Globular star clusters offer the possibility of observing the mass functions of homogeneous old stellar populations. Those for which reliable mass functions have been determined already, however, have generally been subject to dynamical evolution {relaxation, escape of stars, and tidal shocks}, so that the observed mass function is not primordial. We have therefore examined tables of properties of globular clusters in order to choose those that are least likely to have suffered from relaxation, escape, and tidal shocks. We propose two new targets {NGC 2808 and M53}, and dynamical rediscussion of existing data on one other {M3}. To minimize mass-segregation corrections, in each cluster we will select a field at the radius where the local mass function most closely resembles the global mass function. The range of metallicities of the targets will also allow us to estimate the influence of metallicity on the IMF. The team has leading-edge expertise in all the techniques required: making the observations and reducing them to luminosity functions, converting to mass functions, and all types of dynamical modeling, which are required to make the small corrections to global and then initial mass functions.

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