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Pure-helium 3D model atmospheres of white dwarfs
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Cukanovaite, Elena, Tremblay, Pier-Emmanuel, Freytag, B., Ludwig, H-G. and Bergeron, P. (2018) Pure-helium 3D model atmospheres of white dwarfs. Monthly Notices of the Royal Astronomical Society, 481 (2). pp. 1522-1537. doi:10.1093/mnras/sty2383
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WRAP-pure-helium-3D-model-white-dwarfs-Tremblay-2018.pdf - Accepted Version - Requires a PDF viewer. Download (1224Kb) | Preview |
Official URL: https://doi.org/10.1093/mnras/sty2383
Abstract
We present the first grid of 3D simulations for the pure-helium atmospheres of DB white dwarfs. The simulations were computed with the CO5BOLD radiation-hydrodynamics code and cover effective temperatures and surface gravities between 12 000 K ≲ Teff ≲ 34 000 K and 7.5 ≤ log g (cgs units) ≤ 9.0, respectively. In this introductory work, synthetic spectra calculated from the 3D simulations are compared to appropriate 1D model spectra under a differential approach. This results in the derivation of 3D corrections for the spectroscopically derived atmospheric parameters of DB stars with respect to the 1D ML2/α = 1.25 mixing-length parametrization. No significant Teff corrections are found for the V777 Her instability strip region, and therefore no 3D revision is expected for the empirical blue and red edges of the strip. However, large log g corrections are found in the range 12 000 K < Teff < 23 000 K for all log g values covered by the 3D grid. These corrections indicate that 1D model atmospheres overpredict log g, reminiscent of the results found from 3D simulations of pure-hydrogen white dwarfs. The next step will be to compute 3D simulations with mixed helium and hydrogen atmospheres to comprehend the full implications for the stellar parameters of DB and DBA white dwarfs.
| Item Type: | Journal Article | |||||||||
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| Subjects: | Q Science > QB Astronomy | |||||||||
| Divisions: | Faculty of Science > Physics | |||||||||
| SWORD Depositor: | Library Publications Router | |||||||||
| Library of Congress Subject Headings (LCSH): | White dwarf stars -- Simulation methods, Hydrodynamics | |||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||
| Publisher: | Oxford University Press (OUP) | |||||||||
| ISSN: | 1365-2966 | |||||||||
| Official Date: | 1 December 2018 | |||||||||
| Dates: |
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| Volume: | 481 | |||||||||
| Number: | 2 | |||||||||
| Page Range: | pp. 1522-1537 | |||||||||
| DOI: | 10.1093/mnras/sty2383 | |||||||||
| Status: | Peer Reviewed | |||||||||
| Publication Status: | Published | |||||||||
| Publisher Statement: | This is a pre-copyedited, author-produced version of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record E Cukanovaite, P-E Tremblay, B Freytag, H-G Ludwig, P Bergeron; Pure-helium 3D model atmospheres of white dwarfs, Monthly Notices of the Royal Astronomical Society, Volume 481, Issue 2, 1 December 2018, Pages 1522–1537 is available online at: https://doi.org/10.1093/mnras/sty2383 | |||||||||
| Access rights to Published version: | Restricted or Subscription Access | |||||||||
| RIOXX Funder/Project Grant: |
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