Two new pulsating hot subdwarf stars from the Edinburgh-Cape survey

Details Two new pulsating hot subdwarf stars from the Edinburgh-Cape survey Two new pulsating hot subdwarf stars from the Edinburgh-Cape survey

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mnras.396..548k&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 396, Issue 1, pp. 548-552.

Astronomy and Astrophysics

Astronomy

3

Stars: Individual (Ec 01541-1409, Ec 22221-3152), Stars: Oscillations, Stars: Variables

Scientific paper

We report the discovery of very rapid pulsations in two hot subdwarf stars from the Edinburgh-Cape blue object survey. The short periods, small amplitudes and multiperiodicity establish these stars as members of the class of rapidly-pulsating sdB stars. The spectrograms of both stars, however, show relatively strong HeII 4686 and they are therefore more properly classified as sdOB. The light curve of EC 01541-1409 is dominated by two strong (~1 per cent) variations with frequencies near 7114 and 7870 μHz (periods near 140.6 and 127.1 s), though at least five frequencies are present with amplitudes above about 0.002 mag. The light curve of EC 22221-3152 appears to be generated by at least 10 frequencies in the range 5670-11850μHz (about 175-85 s) with amplitudes between about 0.01 and 0.001 mag, including the first overtone of the strongest variation. Somewhat surprisingly, this number of frequencies is detectable in observing runs as short as 3 h, probably due to the fact that the detected frequencies are well-separated.

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