000002098 001__ 2098
000002098 005__ 20160701171658.0
000002098 0247_ $$2DOI$$a10.1093/mnras/stv1515
000002098 037__ $$aASTROimport-255
000002098 100__ $$aSmalley, B.
000002098 245__ $$aKIC 4768731: a bright long-period roAp star in the Kepler field
000002098 260__ $$c2015
000002098 520__ $$aWe report the identification of 61.45 d-1 (711.2 µHz) oscillations, with amplitudes of 62.6 µmag, in KIC 4768731 (HD 225914) using Kepler photometry. This relatively bright (V = 9.17) chemically peculiar star with spectral type A5 Vp SrCr(Eu) has previously been found to exhibit rotational modulation with a period of 5.21 d. Fourier analysis reveals a simple dipole pulsator with an amplitude that has remained stable over a 4-yr time span, but with a frequency that is variable. Analysis of high-resolution spectra yields stellar parameters of Teff = 8100 ± 200 K, log g = 4.0 ± 0.2, [Fe/H] = +0.31 ± 0.24 and v sin i = 14.8 ± 1.6 km s-1. Line profile variations caused by rotation are also evident. Lines of Sr, Cr, Eu, Mg and Si are strongest when the star is brightest, while Y and Ba vary in antiphase with the other elements. The abundances of rare earth elements are only modestly enhanced compared to other roAp stars of similar Teff and log g. Radial velocities in the literature suggest a significant change over the past 30 yr, but the radial velocities presented here show no significant change over a period of 4 yr. 
000002098 700__ $$a Niemczura, E.
000002098 700__ $$a Murphy, S. J.
000002098 700__ $$a Lehmann, H.
000002098 700__ $$a Kurtz, D. W.
000002098 700__ $$a Holdsworth, D. L.
000002098 700__ $$a Cunha, M. S.
000002098 700__ $$a Balona, L. A.
000002098 700__ $$a Briquet, M.
000002098 700__ $$a Bruntt, H.
000002098 700__ $$a De Cat, P.
000002098 700__ $$a Lampens, P.
000002098 700__ $$a Thygesen, A. O.
000002098 700__ $$a Uytterhoeven, K.
000002098 773__ $$c3334-3345$$i4$$pMonthly Notices of the Royal Astronomical Society$$v452$$y2015
000002098 85642 $$ahttp://esoads.eso.org/abs/2015MNRAS.452.3334S
000002098 905__ $$apublished in
000002098 980__ $$aREFERD