  HD 220392 (HR 8895), the brightest member of the visual double star CCDM
23239-5349, is a new short-period variable bright star, probably of the Delta
Scuti type. The period analysis performed on the complete set of definitive
Geneva photometry as well as on the data obtained at the ESO 0.5m telescope
shows two periodicities of about 4.7 and 5.5 cycles per day (cpd) with
amplitudes of 0.014 and 0.011 mag respectively. A similar period search on the
(smaller) dataset obtained for the 1 mag fainter B-component, HD 220391,
however shows no periodicity with an amplitude significantly above the noise
level of the data (about 0.006 mag). This difference in variability behaviour
is discussed from the consideration that both stars form a common origin pair
and are located in the Delta Scuti instability strip.
