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Please use this identifier to cite or link to this item: https://dspace.ffh.bg.ac.rs/handle/123456789/1271
Title: Absorption non-symmetric ion-atom processes in helium-rich white dwarf atmospheres
Authors: Ignjatović, Ljubiša
Mihajlov, A. A.
Sréckovíc, V. A.
Dimitrijevíc, M. S.
Keywords: Atmospheres-white dwarfs;Atomic processes-molecular processes-radiation mechanisms;General-radiative transfer-stars
Issue Date: 1-Jan-2014
Journal: Monthly Notices of the Royal Astronomical Society
Abstract: 
In this work, the processes of absorption charge exchange and photoassociation in He+H+ collisions, together with the process of ion HeH+ photodissociation, are considered as factors influencing the opacities of the atmospheres of helium-rich white dwarfs in the far-UV and extreme ultraviolet (EUV) regions. It is shown that they should be taken into account even in the case of atmospheres of white dwarfs with H:He = 10-5. It is then established that in the case of white dwarfs with H:He ≤ 10-4, particularly when H:He =10-3, these processes have to be included ab initio in the corresponding models of their atmospheres, since in the far-UV and EUV regions they become dominant with respect to known symmetric ion-atom absorption processes. © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
URI: https://dspace.ffh.bg.ac.rs/handle/123456789/1271
ISSN: 0035-8711
DOI: 10.1093/mnras/stu058
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University of Belgrade
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University of Belgrade Faculty of Physical Chemistry