Abstract

HD 220392, the brightest member of the visual double star CCDM 23239-5349 (HR 8895), is a new short-period variable bright star, possibly of the $\delta$ Scuti class. 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 dataset obtained for the 1 mag fainter B-component, HD 220391, shows no periodic behaviour 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 probably form a common origin pair.