Helium-rich white dwarf atmospheres: the non-symmetric ion-atom absorption processes

27th Summer School and International Symposium on the Physics of Ionized Gases

Srekovi, V.A.^1 ; Mihajlov, A.A.^1 ; Ignjatovi, Lj M^1 ; Dimitrijevi, M.S.^2,3,4

University of Belgrade, Institute of Physics, P. O. Box 57, Belgrade

11001, Serbia^1

Astronomical Observatory, Volgina 7, Belgrade 74

11160, Serbia^2

IHIS-Technoexperts, Beanijska 23, Zemun

11080, Serbia^3

Observatoire de Paris, Meudon Cedex

92195, France^4

关键词: Ab initio;    Absorption process;    Charge exchanges;    Dwarf atmospheres;    Ion-atom;    Molecular ions;    UV region;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/565/1/012022/pdf
DOI  :  10.1088/1742-6596/565/1/012022

来源: IOP

【 摘 要 】

Here, the processes of photo-association and absorption charge-exchange in He+H+ collisions together with the process of molecular ion HeH+ photo-dissociation are considered as factors of influence on the opacity of the atmospheres of helium-rich white dwarfs in the far UV region. It is shown that they should be taken into account even in the cases of the atmospheres of white dwarfs with H:He =10-5. Also, it is established that in the cases of white dwarfs with H:He 10-4, especially when H:He 10-3, these processes have to be included ab initio in the corresponding models of their atmospheres.