KPD1930+2752 is a short-period pulsating subdwarf B (sdB) star. It is also an ellipsoidal variable with a known binary period of 2.3 h. The companion is most likely a white dwarf and the total mass of the system is close to the Chandresekhar limit. In this paper, we report the results of Whole Earth Telescope (WET) photometric observations during 2003 and a smaller multisite campaign of 2002. From 355h of WET data, we detect 68 pulsation frequencies and suggest an additional 13 frequencies within a crowded and complex temporal spectrum between 3065 and 6343 μHz (periods between 326 and 157s). We examine pulsation properties including phase and amplitude stability in an attempt to understand the nature of the pulsation mechanism. We examine a stochastic mechanism by comparing amplitude variations with simulated stochastic data. We also use the binary nature of KPD1930+2752 for identifying pulsation modes via multiplet structure and a tidally induced pulsation geometry. Our results indicate a complicated pulsation structure that includes short-period (≈16h) amplitude variability, rotationally split modes, tidally induced modes and some pulsations which are geometrically limited on the sdB star.
Physics, Astronomy, and Materials Science
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. © 2011 the authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Binaries: close, Stars: general, Stars: oscillations, Subdwarfs
Reed, M. D., S. L. Harms, S. Poindexter, A-Y. Zhou, J. R. Eggen, M. A. Morris, A. C. Quint et al. "Whole Earth Telescope observations of the subdwarf B star KPD 1930+ 2752: a rich, short-period pulsator in a close binary." Monthly Notices of the Royal Astronomical Society 412, no. 1 (2011): 371-390.
Monthly Notices of the Royal Astronomical Society