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

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

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mnras.397..453k&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 397, Issue 1, pp. 453-457.

Astronomy and Astrophysics

Astronomy

6

Stars: Individual: Ec 04207-4748, Stars: Individual: Ec 05221-4725, Stars: Oscillations, White Dwarfs

Scientific paper

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 (447s) and its first overtone near 4475 μHz (223s). Two other peaks appear in the periodograms of all three data sets for this star; near 2370 μHz (~420s) and 3000 μHz (~333s), 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 1114μHz (898s), but is obviously multiperiodic and probably has several more frequencies near the one clearly observed.

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