Journal Article

Two new pulsating DB Stars from the EC survey, EC 04207−4748 and EC 05221−4725

D. Kilkenny, D. O'Donoghue, L. A. Crause, N. Hambly and H. MacGillivray

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 397, issue 1, pages 453-457
Published in print July 2009 | ISSN: 0035-8711
Published online July 2009 | e-ISSN: 1365-2966 | DOI:
Two new pulsating DB Stars from the EC survey, EC 04207−4748 and EC 05221−4725

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We report the discovery of pulsations in two DB stars found in the Edinburgh–Cape blue object survey. The light curve of EC 04207−4748 appears to be dominated by a strong variation at 2235 μHz (447 s) and its first overtone near 4475 μHz (223 s). Two other peaks appear in the periodograms of all three data sets for this star; near 2370 μHz (∼420 s) and 3000 μHz (∼333 s), though these are less accurately defined. EC 05221−4725 is less easy to specify with the currently available data; it appears to have one coherent frequency near 1114 μHz (898 s), but is obviously multiperiodic and probably has several more frequencies near the one clearly observed.

Keywords: stars: individual: EC 04207−4748; stars: individual: EC 05221−4725; stars: oscillations; white dwarfs

Journal Article.  2474 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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