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We present a new set of synthesis models for stellar populations obtainedwith Starburst99, which are based on new stellar evolutionary tracks withrotation. We discuss models with zero rotation velocity and with velocities of40% of the break-up velocity on the zero-age main-sequence. These values areexpected to bracket realistic rotation velocity distributions in stellarpopulations. The new rotating models for massive stars are more luminous andhotter due to a larger convective core and enhanced surface abundances. Thisresults in pronounced changes in the integrated spectral energy distribution ofa population containing massive stars. The changes are most significant at theshortest wavelengths where an increase of the ionizing luminosity by up to afactor of 5 is predicted. We also show that high equivalent widths ofrecombination lines may not necessarily indicate a very young age but can beachieved at ages as late as 10 Myr. Comparison of these two boundary cases (0and 40% of the break-up velocity) will allow users to evaluate the effects ofrotation and provide guidance for calibrating the stellar evolution models. Wealso introduce a new theoretical ultraviolet spectral library built from thePotsdam Wolf-Rayet (PoWR) atmospheres. Its purpose is to help identifysignatures of Wolf-Rayet stars in the ultraviolet whose strength is sensitiveto the particulars of the evolution models. The new models are available forsolar and 1/7th solar metallicities. A complete suite of models can begenerated on the Starburst99 website (www.stsci.edu/science/starburst99/). Theupdated Starburst99 package can be retrieved from this website as well.

The Effects of Stellar Rotation. II. A Comprehensive Set of Starburst99 Models