Resolving the pulsations of subdwarf B stars: PG 0154+182, HS 1824+5745 and HS 2151+0857
We continue our programme of extended single-site observations of pulsating 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 HS2151+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 monoperiodic 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.
Physics, Astronomy, and Materials Science
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2006 The authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
star PG 0154+182, star HS 1824+5745, star HS 2151+0857, subdwarfs, variables stars
Reed, M. D., J. R. Eggen, A-Y. Zhou, D. M. Terndrup, S. L. Harms, D. An, and M. A. Hashier. "Resolving the pulsations of subdwarf B stars: PG 0154+ 182, HS 1824+ 5745 and HS 2151+ 0857." Monthly Notices of the Royal Astronomical Society 369, no. 3 (2006): 1529-1536.
Monthly Notices of the Royal Astronomical Society