Atmospheric Temperature Inversions and He i 5876 Core Profile Structure in White Dwarfs Article Swipe
B. Klein
,
Simon Blouin
,
Diego Romani
,
B. Zuckerman
,
Carl Melis
,
Siyi Xu
,
P. Dufour
,
C. Genest-Beaulieu
,
Antoine Bédard
,
M. Jura
·
YOU?
·
· 2020
· Open Access
·
· DOI: https://doi.org/10.3847/1538-4357/ab9b24
YOU?
·
· 2020
· Open Access
·
· DOI: https://doi.org/10.3847/1538-4357/ab9b24
We report distinctive core profiles in the strongest optical helium line, He i λ 5876, from high-resolution high-sensitivity observations of spectral type DB white dwarfs. By analyzing a sample of 40 stars from Keck/HIRES and VLT/UVES, we find the core appearance to be related to the degree of hydrogen and heavy element content in the atmosphere. New Ca K-line measurements or upper limits are reported for about half the sample stars. He i λ 5876 emission cores with a self-reversed central component are present for those stars with relatively low hydrogen abundance, as well as relatively low atmospheric heavy element pollution. This self-reversed structure disappears for stars with higher degrees of pollution and/or hydrogen abundance, giving way to a single absorption core. From our model atmospheres, we show that the self-reversed emission cores can be explained by temperature inversions in the upper atmosphere. We propose that the transition to a single absorption core is due to the additional opacity from hydrogen and heavy elements that inhibits the temperature inversions. Our current models do not exactly match the effective temperature range of the phenomenon or the amplitude of the self-reversed structure, which is possibly a result of missing physics such as 3D treatment, convective overshoot, and/or non-LTE effects. The He i λ 5876 line structure may prove to be a useful new diagnostic for calibrating temperature profiles in DB atmosphere models.
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- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.3847/1538-4357/ab9b24
- https://iopscience.iop.org/article/10.3847/1538-4357/ab9b24/pdf
- OA Status
- bronze
- Cited By
- 10
- References
- 113
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W3035186706
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- OpenAlex ID
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https://openalex.org/W3035186706Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.3847/1538-4357/ab9b24Digital Object Identifier
- Title
-
Atmospheric Temperature Inversions and He i 5876 Core Profile Structure in White DwarfsWork title
- Type
-
articleOpenAlex work type
- Language
-
enPrimary language
- Publication year
-
2020Year of publication
- Publication date
-
2020-08-27Full publication date if available
- Authors
-
B. Klein, Simon Blouin, Diego Romani, B. Zuckerman, Carl Melis, Siyi Xu, P. Dufour, C. Genest-Beaulieu, Antoine Bédard, M. JuraList of authors in order
- Landing page
-
https://doi.org/10.3847/1538-4357/ab9b24Publisher landing page
- PDF URL
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https://iopscience.iop.org/article/10.3847/1538-4357/ab9b24/pdfDirect link to full text PDF
- Open access
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YesWhether a free full text is available
- OA status
-
bronzeOpen access status per OpenAlex
- OA URL
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https://iopscience.iop.org/article/10.3847/1538-4357/ab9b24/pdfDirect OA link when available
- Concepts
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Astrophysics, Stars, Atmosphere (unit), Physics, Opacity, White dwarf, Line (geometry), Effective temperature, Hydrogen, Spectral line, Atmospheric temperature, Astronomy, Atmospheric sciences, Optics, Meteorology, Geometry, Quantum mechanics, MathematicsTop concepts (fields/topics) attached by OpenAlex
- Cited by
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10Total citation count in OpenAlex
- Citations by year (recent)
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2024: 1, 2023: 2, 2022: 2, 2021: 1, 2020: 4Per-year citation counts (last 5 years)
- References (count)
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113Number of works referenced by this work
- Related works (count)
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10Other works algorithmically related by OpenAlex
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