Volume 398, Number 3, February II 2003
|Page(s)||1117 - 1119|
|Section||Stellar structure and evolution|
|Published online||28 January 2003|
A high-precision null result in the search for rapid oscillations in HD 965
Centre for Astrophysics, University of Central Lancashire, Preston PR1 2HE, UK
2 Laboratoire d'Astrophysique de l'OMP, CNRS UMR 5572, Observatoire Midi-Pyrénées, 14 avenue Édouard Belin, 31400 Toulouse, France
3 Observatoire de Paris-Meudon, DAEC, UMR 8632, 92195 Meudon, France
Corresponding author: D. W. Kurtz, firstname.lastname@example.org
Accepted: 22 November 2002
HD 965 is a strongly magnetic peculiar A star with clear Zeeman splitting in its spectral lines, a rotation period greater than 2 yr, H-line core-wing anomaly, and strongly negative Strömgren and indices. All of these characteristics are typical of the rapidly oscillating Ap stars, and it has been suggested that HD 965 should be one. We have tested this star for photometric variability under excellent conditions with low scintillation noise using the 2-m TBL for 2.7 hr at Pic du Midi Observatory. The amplitude spectrum of the light curve is flat with noise peaks below 0.2 mmag in the frequency range of the roAp stars. This suggests that it is a non-oscillating Ap star, although proof of that will need further observations each year for many years, to rule out the possibility that rotational modulation has suppressed the observed amplitude in 2002.
Key words: stars: chemically peculiar / stars: individual: HD 965 / stars: oscillations / stars: variables: general
© ESO, 2003
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