  We present the first comprehensive measurement of $D^{0}, D^{+}, D^{*+}$ and
their charge conjugate states at mid-rapidity in $d$+Au collisions at
$\sqrt{s_{_{NN}}}$=200 GeV using the STAR TPC. The directly measured open charm
multiplicity distribution covers a broad transverse momentum region of
0$<p_{T}<11$ GeV/$c$. The measured $dN/dy$ at mid-rapidity for $D^{0}$ is
$0.0265\pm 0.0036 (stat.) \pm 0.0071 (syst.)$ and the measured $D^{*+}/D^{0}$
and $D^{+}/D^{0}$ ratios are approximately equal with a magnitude of $0.40\pm
0.09(stat.) \pm 0.13(syst.)$. The total $c\bar{c}$ cross section per
nucleon-nucleon collision extracted from this study is $1.18 \pm 0.21(stat.)
\pm 0.39(syst.) $mb. The direct measurement of open charm production is
consistent with STAR single electron data. This cross section is higher than
expectations from PYTHIA and other pQCD calculations. The measured $p_{T}$
distribution is harder than the pQCD prediction using the Peterson
fragmentation function.
