Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-03-29
Mon.Not.Roy.Astron.Soc.369:1529,2006
Astronomy and Astrophysics
Astrophysics
10 pages; acceptable for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2006.10397.x
We continue our programme of extended single-site observations of pulsting subdwarf B (sdB) stars and present the results of extensive time series photometry to resolve the pulsation spectra for use in asteroseismological analyses. PG 0154+182, HS 1824+5745, and HS 2151+0857 were observed at the MDM Observatory during 2004 and 2005. Our observations are sufficient to resolve the pulsations of all three target stars. We extend the number of known frequencies for PG 0154+182 from one to six, confirm that HS 1824+5745 is a mono-periodic pulsator, and extend the number of known frequencies to five for HS 2151+0857. We perform standard tests to search for multiplet structure, measure amplitude variations as pertains to stochastic excitation, and examine the mode density to constrain the mode degree l.
An Deokkeun
Eggen Joseph R.
Harms S. L.
Hashier M. A.
Reed Michael D.
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