Systematic investigation of partonic collectivity through centrality dependence of elliptic flow of multi-strange hadrons in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV in STAR

We present the measurement of centrality dependence of multi-strange hadron ($\mathrm{\Omega }$, $\mathrm{\Xi }$ and $\varphi$) elliptic flow ($v_2$) at mid-rapidity in Au+Au collision at $\sqrt{s_{NN}}$ = 200 GeV. We investigate number-of-constituents quark (NCQ) scaling of identified hadrons $v_2$ for different collision centralities. Maximum deviation from ideal NCQ scaling observed at the level of 10% for centrality 30-80$$ at $(m_T-m_0)\mathrm{/}{n}_q$ $>$ 0.6 GeV/$c^2$. This may indicate smaller contribution to the collectivity from the partonic phase in the peripheral collisions. We also observe the mass ordering of $v_2$ break down between proton and $\varphi$-meson for $p_T$ $<$1 GeV/$c$. This could be due to the effect of later stage hadronic interactions on $v_2$.