Resolving the pulsations of the subdwarf B star KPD 2109+4401

Details Resolving the pulsations of the subdwarf B star KPD 2109+4401 Resolving the pulsations of the subdwarf B star KPD 2109+4401

2005-11-30

arxiv.org/abs/astro-ph/0511827v1

Mon.Not.Roy.Astron.Soc.367:179-185,2006

Astronomy and Astrophysics

Astrophysics

8 pages, 4 figures, 5 tables; Accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2005.09933.x

We present the results of extensive time series photometry of the pulsating subdwarf B star KPD 2109+4401. Our data set consists of 29 data runs with a total length of 182.6 hours over 31 days, collected at five observatories in 2004. These data are comprised of high signal-to-noise observations acquired with larger telescopes and wider time coverage observations obtained with smaller telescopes. They are sufficient to resolve the pulsation structure to 0.4 $\mu$Hz and are the most extensive data set for this star to date. With these data, we identify eight pulsation frequencies extending from 4701 to 5481 $\mu$Hz, corresponding to periods of 182 to 213 s. The pulsation frequencies and their amplitudes are examined over several time-scales with some frequencies showing amplitude variability.

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