Gemini spectra of 12000K white dwarf stars

Details Gemini spectra of 12000K white dwarf stars Gemini spectra of 12000K white dwarf stars

2006-10-11

arxiv.org/abs/astro-ph/0610334v1

Mon.Not.Roy.Astron.Soc.372:1799-1803,2006

Astronomy and Astrophysics

Astrophysics

11 pages and 8 figures

Scientific paper

10.1111/j.1365-2966.2006.10992.x

We report signal-to-noise ratio SNR ~ 100 optical spectra for four DA white dwarf stars acquired with the GMOS spectrograph of the 8m Gemini north telescope. These stars have 18 ~ 21) optical spectra acquired by the Sloan Digital Sky Survey through model atmosphere fitting are trustworthy. Our spectra range from 3800A to 6000A, therefore including H beta to H9. The H8 line was only marginally present in the SDSS spectra, but is crucial to determine the gravity. When we compare the values published by Kleinman et al. (2004) and Eisenstein et al. (2006) with our line-profile (LPT) fits, the average differences are: Delta Teff ~ 320 K, systematically lower in SDSS, and Delta log g ~ 0.24 dex, systematically larger in SDSS. The correlation between gravity and effective temperature can only be broken at wavelengths bluer than 3800 A. The uncertainties in Teff are 60% larger, and in log g larger by a factor of 4, than the Kleinman et al. (2004) and Eisenstein et al. (2006) internal uncertainties.

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