  We continue our exploration of collisionally merged stars in the blue
straggler region of the color-magnitude diagram. We report the results of new
SPH calculations of parabolic collisions between two main-sequence stars, with
the initial structure and composition profiles of the parent stars having been
determined from stellar evolution calculations. Parallelization of the SPH code
has permitted much higher numerical resolution of the hydrodynamics. We also
present evolutionary tracks for the resulting collision products, which emerge
as rapidly rotating blue stragglers. The rotating collision products are
brighter, bluer and remain on the main sequence longer than their non-rotating
counterparts. In addition, they retain their rapid rotation rates throughout
their main sequence lifetime. Rotationally-induced mixing strongly affects the
evolution of the collision products, although it is not sufficient to mix the
entire star. We discuss the implications of these results for studies of blue
straggler populations in clusters. This work shows that off-axis collision
products cannot become blue stragglers unless they lose a large fraction of
their initial angular momentum. The mechanism for this loss is not apparent,
although some possibilities are discussed.
