Astrophysical Implications of a New Dynamical Mass for the Nearby White Dwarf 40 Eridani B

  title={Astrophysical Implications of a New Dynamical Mass for the Nearby White Dwarf 40 Eridani B},
  author={Howard E. Bond and Pierre Bergeron and Antoine B{\'e}dard},
  journal={The Astrophysical Journal},
The bright, nearby DA-type white dwarf (WD) 40 Eridani B is orbited by the M dwarf 40 Eri C, allowing determination of the WD’s mass. Until recently, however, the mass depended on orbital elements determined four decades ago, and that mass was so low that it created several astrophysical puzzles. Using new astrometric measurements, the binary-star group at the U.S. Naval Observatory has revised the dynamical mass upward, to 0.573 ± 0.018 M☉. In this paper, we use model-atmosphere analysis to… 

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