A search of very low amplitude magnetoacoustic pulsations with HARPS

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dc.creatorKochukhov, O.
dc.creatorRyabchikova, T.
dc.creatorBagnulo, S.
dc.creatorCurto, G. Lo
dc.date2007-11-30
dc.date.accessioned2026-07-07T08:46:25Z
dc.date.available2026-07-07T08:46:25Z
dc.descriptionWe have obtained time-resolved spectroscopic observations for a sample of 10 cool Ap stars using the ultra-stable spectrograph HARPS at the ESO 3.6-m telescope. The aim of our study was to search for low-amplitude oscillations in Ap stars with no or inconclusive evidence of pulsational variability. Here we report initial results of our investigation. We confirm the presence of ~16-min period pulsations in beta CrB (HD 137909) and demonstrate multiperiodic character of oscillations in this star. Furthermore, we discovered very low amplitude 9-min pulsations in HD 75445 - an object spectroscopically very similar to known roAp stars.
dc.descriptionsubmitted to Contrib. Astron. Obs. Skalnate Pleso (Proceedings of the CP#Ap Workshop, Vienna, 2007, eds. J. Ziznovsky, J. Zverko, E. Pauntzen, M. Netopil)
dc.identifierhttps://arxiv.org/abs/0711.4923
dc.identifierhttp://arxiv.org/abs/0711.4923
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/143244
dc.subjectAstrophysics
dc.titleA search of very low amplitude magnetoacoustic pulsations with HARPS
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