Gemini spectra of 12 000 K white dwarf stars

@article{Kepler2006GeminiSO,
  title={Gemini spectra of 12 000 K white dwarf stars},
  author={S. O. Kepler and B{\'a}rbara Garcia Castanheira and A. F. M. Costa and Detlev Koester},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2006},
  volume={372},
  pages={1799-1803}
}
We report signal-to-noise ratio (S/N) ≃ 100 optical spectra for four DA white dwarf stars acquired with the GMOS spectrograph of the 8-m Gemini north telescope. These stars have 18 < g < 19 and are around T eff ∼ 12 000 K, where the hydrogen lines are close to maximum. Our purpose is to test if the effective temperatures and surface gravities derived from the relatively low-S/N ((S/N) ≈ 21) optical spectra acquired by the Sloan Digital Sky Survey through model atmosphere fitting are trustworthy… 

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