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A search for very low amplitude magnetoacoustic pulsations with HARPS
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Astronomy and Space Physics.
2008 (English)In: Contributions of the Astronomical Observatory Skalnate Pleso, ISSN 1335-1842, Vol. 38, no 2, 423-424 p.Article in journal (Refereed) Published
Abstract [en]

We 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 approximate to 16-min period pulsations in beta CrB (HD 137909) and demonstrate multi-periodic 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.

Place, publisher, year, edition, pages
2008. Vol. 38, no 2, 423-424 p.
Keyword [en]
stars : atmospheres, stars : chemically peculiar, stars : oscillations, stars : individual : HD 75445, HD 137909
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-149679ISI: 000256514000058OAI: oai:DiVA.org:uu-149679DiVA: diva2:405814
Conference Information: CP/AP Workshop 2007 Vienna, AUSTRIA, SEP 10-14, 2007Available from: 2011-03-23 Created: 2011-03-22 Last updated: 2011-03-23Bibliographically approved

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