We report the identification of 61.45 d ^ { -1 } ( 711.2 \upmu Hz ) oscillations , with amplitudes of 62.6- \upmu mag , in KIC 4768731 ( HD 225914 ) using Kepler photometry .
This relatively bright ( V =9.17 ) chemically peculiar star with spectral type A5 Vp SrCr ( Eu ) has previously been found to exhibit rotational modulation with a period of 5.21 d. Fourier analysis reveals a simple dipole pulsator with an amplitude that has remained stable over a 4-yr time span , but with a frequency that is variable .
Analysis of high-resolution spectra yields stellar parameters of T _ { eff } = 8100 \pm 200 K , \log g = 4.0 \pm 0.2 , [ Fe/H ] = +0.31 \pm 0.24 and v \sin i = 14.8 \pm 1.6 km s ^ { -1 } .
Line profile variations caused by rotation are also evident .
Lines of Sr , Cr , Eu , Mg and Si are strongest when the star is brightest , while Y and Ba vary in anti-phase with the other elements .
The abundances of rare earth elements are only modestly enhanced compared to other roAp stars of similar T _ { eff } and \log g .
Radial velocities in the literature suggest a significant change over the past 30 yr , but the radial velocities presented here show no significant change over a period of 4 yr .