The Star-Formation History of the Large Magellanic Cloud

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Hst Proposal Id #7382 Stellar Populations

Scientific paper

We propose to efficiently tile two selected areas of the Large Magellanic Cloud {LMC} with a combination of WFPC2 and NICMOS imaging to obtain definitive color-magnitude diagrams {CMDs} for LMC field stars in visual and near-infrared colors. These data will enable us to quantitativly study the intermediate to low-mass stellar populations and the star-formation history of the LMC. Our observations will reach to V=24, which is well below the oldest main-sequence turnoff, and thus we will probe the entire star-formation history of the LMC. Our goal is to observe approximately 10, 000 stars in the region of the CMD from the oldest main sequence turnoff to the lower red giant branch. Such large samples gives us the ability to measure a 20 percent change in the star-formation rate averaged over 1 Gyr intervals at the 2-sigma level. From this data set, we will generate the best CMDs ever obtained for an evolving stellar population in another galaxy. Quantitative comparisons between observed and model CMDs depend on several parameters, and we will compare the data with models using statistically rigorous techniques that we have developed. Comparisons of the results in each area will allow us to separate local from global evolutionary patterns in the LMC.

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