On the discovery of new behaviour in the oscillation of HD 101065

A 9 h of observation through high-speed B photometry was carried out on HD 101065 using the 0.5-m telescope of the South African Astronomical Observatory (SAAO). These photometric data were obtained between 2013 April 21 and June 19, in search of temporal variations in the oscillation of HD 101065. The frequency analysis of our data sets shows that the known principal frequency of oscillation (ν1=1.37287 mHz) is still much intact. On nightly basis, we detected the presence of secondary frequencies (ν2) that are well resolved from the principal frequency (ν1) in the region of 1.0 mHz (P ∼ 17 min). These frequencies with very good signal-to-noise ratio have no harmonic period ratio with the principal frequency (ν1). Furthermore, the amplitude spectra of individual nights reveal that the newly detected frequency (ν2) is undergoing amplitude modulation on a short time-scale of few hours.