This title appears in the Scientific Report :
2017
Infrared Opacities in Dense Atmospheres of Cool White Dwarf Stars
Infrared Opacities in Dense Atmospheres of Cool White Dwarf Stars
Dense, He-rich atmospheres of cool white dwarfs represent a challenge to the modeling. This is because these atmospheres are constituted of a dense fluid in which strong multi-atomic interactions determine their physics and chemistry. Therefore, the ideal-gas-based description of absorption is no lo...
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Personal Name(s): | Kowalski, Piotr (Corresponding author) |
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Blouin, Simon / Dufour, P. | |
Contributing Institute: |
Nukleare Entsorgung; IEK-6 |
Published in: | 2017 |
Published in: |
[Print] 20th European White Dwarf Workshop : proceedings of a conference held at University of Warwick, Coventry, West Midlands, United Kingdom, 25-29 July 2016 / Tremblay, Pier-Emmanuel ; Gänsicke, Boris T. ; Marsh, Tom First edition, San Francisco : Astronomical Society of the Pacific, [2017], |
Imprint: |
San Francisco, Calif.
Astronomical Society of the Pacific
2017
|
Physical Description: |
xxii, 579 Seiten : Illustrationen, Diagramme |
ISBN: |
978-1-58381-903-6 9781583819036 |
Conference: | 20th European White Dwarf Workshop, Warwick (UK), 2016-07-25 - 2016-07-29 |
Document Type: |
Contribution to a book Contribution to a conference proceedings |
Research Program: |
Nuclear Waste Management |
Edition: | First edition |
Series Title: |
Astronomical Society of the Pacific conference series
509 |
Subject (ZB): | |
Publikationsportal JuSER |
Dense, He-rich atmospheres of cool white dwarfs represent a challenge to the modeling. This is because these atmospheres are constituted of a dense fluid in which strong multi-atomic interactions determine their physics and chemistry. Therefore, the ideal-gas-based description of absorption is no longer adequate, which makes the opacities of these atmospheres difficult to model. This is illustrated with severe problems in fitting the spectra of cool, He-rich stars. Good description of the infrared (IR) opacity is essential for proper assignment of the atmospheric parameters of these stars. Using methods of computational quantum chemistry we simulate the IR absorption of dense He/H media. We found a significant IR absorption from He atoms (He-He-He CIA opacity) and a strong pressure distortion of the H$_2$-He collision-induced absorption (CIA). We discuss the implication of these results for interpretation of the spectra of cool stars. |