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| Paper: |
3D Model Atmospheres of DA White Dwarfs |
| Volume: |
469, 18th European White Dwarf Workshop (EUROWD12) |
| Page: |
155 |
| Authors: |
Tremblay, P.-E.; Ludwig, H.-G.; Steffen, M.; Freytag, B. |
| Abstract: |
The spectroscopically determined surface gravities of cool hydrogen-atmosphere
DA white dwarfs are significantly higher than the mean value of log g ∼
8 found for hotter objects with radiative atmospheres (Teff > 13000
K). It was recently suggested that a problem with the treatment of convective
energy transport in the 1D mixing-length theory was the explanation for this
high-log g problem. We have now computed a grid of pure-hydrogen 3D model
atmospheres with the CO5BOLD code for surface gravities from log g = 7
to 8.5 and effective temperatures from 6000 to 13000 K. Over this
range, the intensity contrast of the surface granulation pattern, which
describes the strength of the 3D effects, is varying significantly. We confirm
the result of an earlier investigation that 3D model spectra provide a much
better characterization of the mass distribution of cool white dwarfs. |
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