  We present STAR measurements of relative charm and bottom contributions to
NPE from $p+p$ collisions at $\sqrt{s}$= 200 and 500 GeV energies. We report
the total bottom quark production cross section from p+p collisions at
$\sqrt{s}= 200$ GeV extracted from NPE spectrum and B to D ratios. We also
present the NPE-hadron azimuthal correlations from $Au+Au$ collisions at
$\sqrtsNN = 200$ GeV from the 2010 RHIC run where we have collected high
statistics data set with low photonic conversion background.
