A Search for Pulsations in Helium White Dwarfs

@article{Steinfadt2011ASF,
  title={A Search for Pulsations in Helium White Dwarfs},
  author={Justin D. R. Steinfadt and Lars Bildsten and David L. Kaplan and Benjamin J. Fulton and Steve B. Howell and Thomas R. Marsh and Eran. O. Ofek and Avi Shporer},
  journal={Publications of the Astronomical Society of the Pacific},
  year={2011},
  volume={124},
  pages={1 - 13}
}
The recent plethora of sky surveys, especially the Sloan Digital Sky Survey, have discovered many low-mass (M < 0.45 M⊙) white dwarfs that should have cores made of nearly pure helium. These WDs come in two varieties: those with masses 0.2 < M < 0.45 M⊙ and H envelopes so thin that they rapidly cool and those with M < 0.2 M⊙ (often called extremely low mass [ELM] WDs) that have thick enough H envelopes to sustain 109 yr of H burning. In both cases, these WDs evolve through the ZZ Ceti… 

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