Measurements of $W$ boson production in association with heavy flavour at ATLAS

The production of $W/Z$ bosons in association with heavy flavour jets or hadrons at the LHC is sensitive to the flavour content of the proton and provides an important test of perturbative QCD. The production of a $W$ boson in association with $D^{+}$ and $D^{*+}$ mesons will be discussed. This precision measurement provides information about the strange content of the proton. Measurements are compared to the state-of-the art next-to-next-to-leading order theoretical calculations.