UBV Stellar Photometry of the 30 Doradus region of the LMC with the Hubble Space Telescope

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The 30 Doradus region of the Large Magellanic Cloud is of great interest because it is the nearest starburst region. As such, it is a vital link to the understanding of other more distant starburst regions. We have obtained new B-band (F439W) images of 30 Doradus with the Planetary Camera of the Hubble Space Telescope. The combination of the one 30 second and four 180 second exposures gives us a clean, high signal-to-noise image on which we resolve over 800 stars in the central region of 30 Doradus. This includes over 200 stars within 3.('') 0 of the center of R136a. Stellar photometry of this image has been done using the PSF fitting method for HST data of Malumuth et al. (1991). This gives us a third color along with previous U and V magnitudes determined from images taken as part of the Science Assessment Program of the HST. These new B-band images should in principle be the best data so far since the U-band and V-band images were obtained prior to the UV flood procedure for the WFPC. There are now over 450 stars with U, B and V magnitudes. We will show the color-color and color-magnitude diagrams for 30 Doradus. The luminosity function and the derived mass function will be shown for the stars, both within R136a and outside of R136a. We will show that the stars in R136a have a top heavy mass function compared to the rest of 30 Doradus. Finally, we will use star counts to examine the dynamical structure of 30 Doradus. indent 0.0in Malumuth, E. M., Neill, J. D., Lindler, D. J., and Heap, S. R., 1991, in The First Year of HST Observations, ed. A. L. Kinney and J.C. Blades (Baltimore:Space Telescope Science Institute), p249.

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