We present STAR results on the elliptic flow v 2 of charged hadrons, strange and multistrange particles from √ s NN = 200 GeV Au+Au collisions at the BNL Relativistic Heavy Ion Collider (RHIC). The detailed study of the centrality dependence of v 2 over a broad transverse momentum range is presented. Comparisons of different analysis methods are made in order to estimate systematic uncertainties. To discuss the nonflow effect, we have performed the first analysis of v 2 with the Lee-Yang zero method for K 0 S and . In the relatively low p T region, p T 2 GeV/c, a scaling with m T − m is observed for identified hadrons in each centrality bin studied. However, we do not observe v 2 (p T ) scaled by the participant eccentricity to be independent of centrality. At higher p T , 2 p T 6 GeV/c, v 2 scales with quark number for all hadrons studied.

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