  We report on the production of ultracold heteronuclear YbLi* molecules in a
dual-species magneto-optical trap by photoassociation (PA). The formation of
the electronically excited molecules close to dissociation was observed by trap
loss spectroscopy. We find 4 rovibrational states within a range of $250\,$GHz
below the Yb($^1S_0$) + Li($^2P_{1/2}$) asymptote and observe isotopic PA line
shifts in mixtures of $^6$Li with $^{174}$Yb, $^{172}$Yb, and $^{176}$Yb. We
also describe our theoretical ab-initio calculation for the relevant electronic
potentials and utilize it to analyze and identify the lines in the
experimentally observed spectrum.
