Discovery of an ultramassive pulsating white dwarf

@article{Hermes2013DiscoveryOA,
  title={Discovery of an ultramassive pulsating white dwarf},
  author={J. Hermes and S. O. Kepler and B. Castanheira and A. Gianninas and D. Winget and M. Montgomery and Warren R. Brown and S. Harrold},
  journal={arXiv: Solar and Stellar Astrophysics},
  year={2013}
}
We announce the discovery of the most massive pulsating hydrogen-atmosphere (DA) white dwarf (WD) ever discovered, GD 518. Model atmosphere fits to the optical spectrum of this star show it is a 12,030 +/- 210 K WD with a log(g) = 9.08 +/- 0.06, which corresponds to a mass of 1.20 +/- 0.03 Msun. Stellar evolution models indicate that the progenitor of such a high-mass WD endured a stable carbon-burning phase, producing an oxygen-neon-core WD. The discovery of pulsations in GD 518 thus offers… Expand
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