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Here, we compare radiative accelerations (g_rad) derived from the new OpacityProject (OP) data with those computed from OPAL and some previous data from OP.For the case where we have full data from OPAL, the differences in theRosseland mean opacities between OPAL and the new OP data are within 12% andless than 30% between new OP and previous OP data (OP1 at CDS). The radiativeaccelerations g_rad differ at up to the 17% level when compared to OPAL and upto the 38% level when compared to OP1. The comparison with OP1 on a larger(rho-T) space gives a difference of up to 40% for g_rad(C). And it increasesfor heavier elements. The differences increase for heavier elements reaching60% for Si and 65% for S and Fe. We also constructed four representativestellar models in order to compare the new OP accelerations with priorpublished results that used OPAL data. The Rosseland means overall agree betterthan 10% for all of our cases. For the accelerations, the comparisons withpublished values yield larger differences in general. The published OPALaccelerations for carbon are even larger relative to OP compare to what ourdirect comparisons would indicate. Potential reasons for this puzzling behaviorare discussed. In light of the significant differences in the inferredacceleration rates, theoretical errors should be taken into account whencomparing models with observations. The implications for stellar evolution arebriefly discussed. The sensitivity of g_rad to the atomic physics may provide auseful test of different opacity sources.Comment: 29 pages, 6 figures, submitted to Ap

Comparison of Radiative Accelerations Obtained with Atomic Data from OP and OPAL