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

Abstract

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.

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

References in corpus (6)

• Structural Parameters of the Hot Pulsating B Subdwarf PG 1219+534 from Asteroseismology
• Whole Earth Telescope observations of BPM 37093: a seismological test of crystallization theory in white dwarfs
• Internal rotation of subdwarf B stars: limiting cases and asteroseismological consequences
• Observations of the pulsating subdwarf B star Feige 48: Constraints on evolution and companions
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• Follow-up observations of pulsating subdwarf B stars: Multisite campaigns on PG 1618+563B and PG 0048+091
• Three new pulsating sdB stars discovered with SuperWASP
• Time-series Spectroscopy and Photometry of the Pulsating Subdwarf B Star PG 1219+534 (KY UMa)
• Resolving the pulsations of subdwarf B stars: PG 0154+182, HS 1824+5745, and HS 2151+0857