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We present the results of an elliptic flow analysis of Cu+Cu collisionsrecorded with the STAR detector at 62.4 and 200GeV. Elliptic flow as a functionof transverse momentum is reported for different collision centralities forcharged hadrons and strangeness containing hadrons $K_{S}^{0}$, $\Lambda$,$\Xi$, $\phi$ in the midrapidity region $|eta|<1.0$. Significant reduction insystematic uncertainty of the measurement due to non-flow effects has beenachieved by correlating particles at midrapidity, $|\eta|<1.0$, with those atforward rapidity, $2.5<|\eta|<4.0$. We also present azimuthal correlations inp+p collisions at 200 GeV to help estimating non-flow effects. To study thesystem-size dependence of elliptic flow, we present a detailed comparison withpreviously published results from Au+Au collisions at 200 GeV. We observe that$v_{2}$($p_{T}$) of strange hadrons has similar scaling properties as werefirst observed in Au+Au collisions, i.e.: (i) at low transverse momenta,$p_T<2GeV/c$, $v_{2}$ scales with transverse kinetic energy, $m_{T}-m$, and(ii) at intermediate $p_T$, $2<p_T<4GeV/c$, it scales with the number ofconstituent quarks, $n_q$. We have found that ideal hydrodynamic calculationsfail to reproduce the centrality dependence of $v_{2}$($p_{T}$) for $K_{S}^{0}$and $\Lambda$. Eccentricity scaled $v_2$ values, $v_{2}/\epsilon$, are largerin more central collisions, suggesting stronger collective flow develops inmore central collisions. The comparison with Au+Au collisions which go furtherin density shows $v_{2}/\epsilon$ depend on the system size, number ofparticipants $N_{part}$. This indicates that the ideal hydrodynamic limit isnot reached in Cu+Cu collisions, presumably because the assumption ofthermalization is not attained.

Charged and strange hadron elliptic flow in Cu+Cu collisions at $\sqrt{s_{NN}}$ = 62.4 and 200 GeV