Skip to content Skip to navigation
University of Warwick
  • Study
  • |
  • Research
  • |
  • Business
  • |
  • Alumni
  • |
  • News
  • |
  • About

University of Warwick
Publications service & WRAP

Highlight your research

  • WRAP
    • Home
    • Search WRAP
    • Browse by Warwick Author
    • Browse WRAP by Year
    • Browse WRAP by Subject
    • Browse WRAP by Department
    • Browse WRAP by Funder
    • Browse Theses by Department
  • Publications Service
    • Home
    • Search Publications Service
    • Browse by Warwick Author
    • Browse Publications service by Year
    • Browse Publications service by Subject
    • Browse Publications service by Department
    • Browse Publications service by Funder
  • Help & Advice
University of Warwick

The Library

  • Login
  • Admin

Pure-helium 3D model atmospheres of white dwarfs

Tools
- Tools
+ Tools

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

[img]
Preview
PDF
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

Request Changes to record.

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
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:
DateEvent
1 December 2018Published
31 August 2018Available
28 August 2018Accepted
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:
Project/Grant IDRIOXX Funder NameFunder ID
677706-WD3DH2020 European Research Councilhttp://dx.doi.org/10.13039/100010663
SFB 881[DFG] Deutsche Forschungsgemeinschafthttp://dx.doi.org/10.13039/501100001659
Related URLs:
  • https://academic.oup.com/journals/pages/...

Request changes or add full text files to a record

Repository staff actions (login required)

View Item View Item

Downloads

Downloads per month over past year

View more statistics

twitter

Email us: wrap@warwick.ac.uk
Contact Details
About Us