We present measurements of elliptic flow ($v_2$) of electrons from the decays of heavy-flavor hadrons ($e_{HF}$) by the STAR experiment. For Au+Au collisions at $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-particle correlations ($v_2${4}). For Au+Au collisions at $sqrt{s_{rm NN}}$ = 62.4 and 39 GeV we report $v_2${2} for $p_T< 2$ GeV/c. $v_2${2} and $v_2${4} are non-zero at low and intermediate $p_T$ at 200 GeV, and $v_2${2} is consistent with zero at low $p_T$ at other energies. The $v_2${2} at the two lower beam energies 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 less strongly with the surrounding nuclear matter at those two lower energies compared to $sqrt{s_{rm NN}} = 200$ GeV.
The $jpsi$ $pt$ spectrum and nuclear modification factor ($raa$) are reported for $pt < 5 gevc$ and $|y|<1$ from 0% to 60% central Au+Au and Cu+Cu collisions at $snn = 200 gev$ at STAR. A significant suppression of $pt$-integrated $jpsi$ production
is observed in central Au+Au events. The Cu+Cu data are consistent with no suppression, although the precision is limited by the available statistics. $raa$ in Au+Au collisions exhibits a strong suppression at low transverse momentum and gradually increases with $pt$. The data are compared to high-$pt$ STAR results and previously published BNL Relativistic Heavy Ion Collider results. Comparing with model calculations, it is found that the invariant yields at low $pt$ are significantly above hydrodynamic flow predictions but are consistent with models that include color screening and regeneration.
