We continue our program of single-site observations of pulsating subdwarf B (sdB) stars and present the results of extensive time series photometry of HS 0039+4302 and 0444+0458. Both were observed at MDM Observatory during the fall of 2005. We extend the number of known frequencies for HS 0039+4302 from four to 14 and discover one additional frequency for HS 0444+0458, bringing the total to three. We perform standard tests to search for multiplet structure, measure amplitude variations and examine the frequency density to constrain the mode degree ℓ. Including the two stars in this paper, 23 pulsating sdB stars have received follow-up observations designed to decipher their pulsation spectra. It is worth an examination of what has been detected. We compare and contrast the frequency content in terms of richness and range and the amplitudes with regard to variability and diversity. We use this information to examine observational correlations with the proposed κ pulsation mechanism as well as alternative theories.


Physics, Astronomy, and Materials Science

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This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2007 The authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.


stars individual HS 0039+4302, stars individual HS 0444+0857, stars oscillations, subdwarfs, stars variables others

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Monthly Notices of the Royal Astronomical Society