Primordial Mass Segregation and Main Sequence Age Spreads in Young LMC Clusters

Details Primordial Mass Segregation and Main Sequence Age Spreads in Young LMC Clusters Primordial Mass Segregation and Main Sequence Age Spreads in Young LMC Clusters

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5904f&link_type=abstract

HST Proposal ID #5904

Computer Science

Hst Proposal Id #5904 Stellar Populations

Scientific paper

Most stars form in clusters, but the details of this process remain very poorly understood. A clearer picture of cluster formation is essential to understanding star formation and the spectral, photometric, and chemical evolution of composite stellar systems. By using the high-resolution imaging capabilities of the WFPC2 to study young clusters in the Large Magellanic Cloud, we will make the first tests that will clearly distinguish between the primary competing theories of cluster formation. Images in V and I of the clusters and background fields will yield precise, well-populated luminosity functions and color-magnitude diagrams. While previous studies of LMC clusters have concentrated on determining global mass functions, primordial mass segregation and age spreads are much stronger diagnostics of cluster- formation theories. We will also use these observations to test models of high-mass stars, to improve the Cepheid distance calibration, and, in conjunction with ground-based kinematic data, to determine the initial mass function down to the low-mass cut-off. The measurement of primordial mass segregation will, for the first time, provide the initial conditions for models of cluster dynamical evolution.

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