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Star formation rates in galaxies are frequently estimated using the Balmerline fluxes. However, these can be systematically underestimated because dustcompetes for the absorption of Lyman continuum photons in the ionized gas. Herewe present theoretical correction factors in a simple analytic form. T Thesefactors scale as the product of the ionization parameter, ${\cal U}$, and thenebular O/H abundance ratio, both of which can now be derived from theobservation of bright nebular line ratios. The correction factors are onlysomewhat dependent upon the photoelectron production by grains, but are verysensitive to the presence of complex PAH-like carbonaceous molecules in theionized gas, providing that these can survive in such an environment.Comment: 13 pages, 1 figures, Accepted for publication in ApJ. (Feb 1, 2003

Internal Dust Correction Factors for Star Formation Rates Derived for Dusty HiiRegions and Starburst Galaxies