  The results of a search for an excited bottom-quark b* in pp collisions at
sqrt(s)=7 TeV, using 4.7/fb of data collected by the ATLAS detector at the LHC
are presented. In the model studied, a single b*-quark is produced through a
chromomagnetic interaction and subsequently decays to a W boson and a
top-quark. The search is performed in the dilepton and lepton+jets final
states, which are combined to set limits on b*-quark couplings for a range of
b*-quark masses. For a benchmark with unit size chromomagnetic and Standard
Model-like electroweak b* couplings, b*-quarks with masses less than 870 GeV
are excluded at the 95% credibility level.
