Figure 1.
HST WFPC2 image of the Sirius system showing the overexposed image of Sirius A, with its four diffraction spikes. The vertical bar is the ‘bleed’ of Sirius A into adjacent pixels along the readout columns of the CCD, due to the overexposure. Sirius B lies just to the right of the bottom-left diffraction spike. The grey box represents the dimensions of the 52 × 0.2 arcsec2 slit, which cuts across Sirius B and two of the diffraction spikes.
