Is the IMF universal at low stellar masses?

Details Is the IMF universal at low stellar masses? Is the IMF universal at low stellar masses?

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8134n&link_type=abstract

HST Proposal ID #8134

Physics

1

Hst Proposal Id #8134 Stellar Populations In Clusters

Scientific paper

Our recent finding of a flat IMF below 3 M_odot in the LMC cluster R136 raises a pressing question: is the IMF universal at low masses? We propose to address the issue by taking deep WFPC2 images of eleven young, rich clusters in the LMC/SMC, at different conditions of star density, metallicity and age. We will investigate the low end of the IMF {5 - 0.5 M_odot} with the objective of exploring how the local conditions may impact the IMF at low masses. By restricting the sample to the LMC/SMC, uncertainties due to distances, reddening corrections, and field star contamination are eliminated or largely reduced. Such effects are a major source of uncertainty in IMF determinations of young Galactic clusters and associations. Only HST can provide the resolution and limiting magnitude required to reach the low-mass end of the IMF at extragalactic distances. With such a systematic study we will be able to remove all the uncertainties related to different reduction and ana ly sis methods, perform a useful comparison of the results, and explore the parameter space of the physical conditions and their impact on the IMF.

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