2017MNRAS.466..122K

We present photometric and high-dispersion spectroscopic measurements that show HR 7920 is a periodic variable. The photometry reveals at least four frequencies higher that 10 d^–1, two of which are also probably present in the radial velocity variations. The frequencies are in a range typical of δ Scuti star pulsations. A further low frequency of about 2.8 d^–1 may be present in both radial velocities and photometry; if real, this points to γ Doradus variability, which would make HR 7920 a hybrid pulsator. An attempt is made to identify the modes of the δ Scuti pulsations, which include both radial and non-radial modes. A new rotational velocity of 75 km s^–1 is derived from co-added spectra, contrasting with published values in the range 128-150 km s^–1.