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

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 thr...

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Bibliographic Details
Published in:	Monthly notices of the Royal Astronomical Society 2009-07, Vol.397 (1), p.453-457
Main Authors:	Kilkenny, D., O'Donoghue, D., Crause, L. A., Hambly, N., MacGillivray, H.
Format:	Article
Language:	eng
Subjects:	Astronomy Earth, ocean, space Exact sciences and technology Stars & galaxies stars: individual: EC 04207−4748 stars: individual: EC 05221−4725 stars: oscillations white dwarfs
Online Access:	Get full text
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Summary:	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.
ISSN:	0035-8711 1365-2966