Asteroseismology of Przybylski's star with HARPS

We present the detection of a rich l0-2 p-mode oscillation spectrum in the most chemically-peculiar roAp star HD 101065 (Przybylski's star). Constructed echelle-diagrams exhibit both large (Δν64.07 μHz) and small (5-7 μHz) frequency spacings. We have calculated the nonadiabatic frequencies of axisymmetric high-order p-modes using main sequence models with dipole magnetic fields and masses ranging from 1.5 to 1.7 M. Two sets of chemical composition (X,Z) (0.7, 0.02) and (0.695, 0.025) were adopted. We find the model with Z0.02, log Teff 3.8150, log L/L 0.7710, M 1.50 M, Age 1.6 10⁹yr, Bp 9.00 kG fits the observed oscillation spectrum very well. Further progress in improving the asteroseismic modelling of Przybyzlski's star requires increasing the accuracy of determination of oscillation spectrum with mode spacings less than 1μHz.