  The very wide double star CCDM 23239-5349 is an interesting study case of a
pulsating star within a common origin pair or wide binary. Both stars are
located in the Delta Scuti instability strip. Based on data obtained at La
Silla (Chile), at the Swiss 0.7m and the ESO 0.5m telescopes, we found two
periodicities of about 4.7 and 5.5 cycles per day (cpd) with amplitudes of
0.014 and 0.011 mag, respectively, for HD 220392, the brightest member of the
system. The most dominant periodicity was also detected in the Hipparcos Epoch
Photometry data. A similar period search on the (smaller) dataset obtained for
the 1 mag fainter B-component, HD 220391, however shows no periodic behaviour
with an amplitude significantly above the noise level of the data (about 0.006
mag).
