Journal Article

The discovery of rapid oscillations in the magnetic Ap stars HD 69013 and HD 96237*

V. G. Elkin, D. W. Kurtz, H. L. Worters, G. Mathys, B. Smalley, F. van Wyk and A. M. S. Smith

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 411, issue 2, pages 978-982
Published in print February 2011 | ISSN: 0035-8711
Published online February 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.17747.x
The discovery of rapid oscillations in the magnetic Ap stars HD 69013 and HD 96237*

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We report the detection of short-period variations in the stars HD 69013 and HD 96237. These stars possess large overabundances of rare earth elements and global magnetic fields, thus belong to the class of chemically peculiar Ap stars of the main sequence. Pulsations were found from analysis of high time resolution spectra obtained with the European Southern Observatory (ESO) Very Large Telescope using a cross-correlation method for wide spectral bands, from lines belonging to rare earth elements and from the Hα core. Pulsation amplitudes reach more than 200 m s−1 for some lines in HD 69013 with a period of 11.4 min and about 100 m s−1 in HD 96237 with periods near 13.6 min. The pulsations have also been detected in photometric observations obtained at the South African Astronomical Observatory.

Keywords: stars: chemically peculiar; stars: magnetic field; stars: oscillations

Journal Article.  2800 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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