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We present the measurements of strange hadron elliptic flow at mid-rapidityin Au + Au collisions at $\sqrt{s_{NN}}$ = 7.7 - 200 GeV using the STARdetector in the years 2010 and 2011. The transverse momentum and collisioncentrality dependence of elliptic flow is presented. At the intermediatetransverse momentum $\Omega$ baryon and $\phi$-meson show baryon-mesonseparation effect similar to proton and pion for minimum-bias Au+Au collisionat $\sqrt{s_{NN}}$ =200 GeV. This indicates formation of collective flow at theearly partonic phase. The separation between baryons and mesons at intermediatetransverse momentum decreases with decrease in beam energy and almostdisappears at $\sqrt{s_{NN}}$ $\leq$ 11.5 GeV, indicating hadronic interactionbeing dominant at the lower beam energy. We observe difference in elliptic flowbetween particle and anti-particle and this increases with decrease in beamenergy. Differences are larger for baryons than mesons. Relative differencebetween particle and anti-particle elliptic flow is larger in centralcollisions than in peripheral ones.

Probing the QCD phase diagram with measurements of strange hadron elliptic flow in STAR