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We present measurements of elliptic flow ($v_2$) of electrons from the decaysof heavy-flavor hadrons ($e_{HF}$) by the STAR experiment. For Au+Au collisionsat $\sqrt{s_{\rm NN}} = $ 200 GeV we report $v_2$, for transverse momentum($p_T$) between 0.2 and 7 GeV/c using three methods: the event plane method($v_{2}${EP}), two-particle correlations ($v_2${2}), and four-particlecorrelations ($v_2${4}). For Au+Au collisions at $\sqrt{s_{\rm NN}}$ = 62.4 and39 GeV we report $v_2${2} for $p_T< 2$ GeV/c. $v_2${2} and $v_2${4} arenon-zero at low and intermediate $p_T$ at 200 GeV, and $v_2${2} is consistentwith zero at low $p_T$ at other energies. The $v_2${2} at the two lower beamenergies is systematically lower than at $\sqrt{s_{\rm NN}} = $ 200 GeV for$p_T < 1$ GeV/c. This difference may suggest that charm quarks interact lessstrongly with the surrounding nuclear matter at those two lower energiescompared to $\sqrt{s_{\rm NN}} = 200$ GeV.

Elliptic flow of electrons from heavy-flavor hadron decays in Au+Au collisions at $\sqrt{s_{\rm NN}} = $ 200, 62.4, and 39 GeV