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We present STAR results on the elliptic flow v_2 of charged hadrons, strangeand multi-strange particles from sqrt(s_NN) = 200 GeV Au+Au collisions at RHIC.The detailed study of the centrality dependence of v_2 over a broad transversemomentum range is presented. Comparison of different analysis methods are madein order to estimate systematic uncertainties. In order to discuss the non-floweffect, we have performed the first analysis of v_2 with the Lee-Yang Zeromethod for K_s^0 and Lambda.  In the relatively low p_T region, p_T <= 2 GeV/c, a scaling with m_T - m isobserved for identified hadrons in each centrality bin studied. However, we donot observe v_2(p_T) scaled by the participant eccentricity to be independentof centrality. At higher p_T, 2 GeV/c <= p_T <= 6 GeV/c, v_2 scales with quarknumber for all hadrons studied. For the multi-strange hadron Omega, which doesnot suffer appreciable hadronic interactions, the values of v_2 are consistentwith both m_T -m scaling at low p_T and number-of-quark scaling at intermediatep_T. As a function of collision centrality, an increase of p_T-integrated v_2scaled by the participant eccentricity has been observed, indicating a strongercollective flow in more central Au+Au collisions.

Centrality dependence of charged hadron and strange hadron elliptic flow from sqrt(s_NN) = 200 GeV Au+Au collisions