Unusually high circumstellar absorption variability around the δ Scuti /λ Boötis star HD 183324

We present both archival and new high-spectral resolution visible observations of the δ Scuti/λ Boötis star HD 183324 recorded over the 2009-2013 timeframe. Previous observations of this A0V-type star have hinted at the presence of a circumstellar disc of gas surrounding the star. These new spectral data unequivocally show a remarkably high level of variable absorption activity, whose behaviour is typical of a stellar system in which gas is added to a circumstellar disc on a sporadic basis due to the evaporation of planetesimal-like objects (I.e. 'exocomets'). This planetesimal material most probably resides in an IR-emitting debris disc of dust and gas, similar to that of the β Pictoris exoplanet system that has recently been shown to harbor an exoplanet.