Excitation and deexcitation processes in atom-Rydberg atom collisions in helium-rich white dwarf atmospheres

被引：6

作者：

Sreckovic, V. A. ^{[1
,2
]}

Mihajlov, A. A. ^{[1
,2
]}

Ignjatovic, Lj M. ^{[1
,2
]}

Dimitrijevic, M. S. ^{[2
,3
,4
]}

机构：

[1] Univ Belgrade, Inst Phys, Belgrade 11001, Serbia

[2] Inst Isaac Newton, Yugoslavia Branch, Belgrade 11060, Serbia

[3] Astron Observ, Belgrade 11060 74, Serbia

[4] Observ Paris, F-92195 Meudon, France

来源：

ASTRONOMY & ASTROPHYSICS | 2013年 / 552卷

关键词：

atomic processes; astrochemistry; stars: atmospheres; white dwarfs; CHEMI-RECOMBINATION PROCESSES; H-H+-E; H-2(+)-E RECOMBINATION; RATE COEFFICIENTS; SOLAR ATMOSPHERE; SLOW COLLISIONS; IONIZATION; HYDROGEN; H-ASTERISK(N); POPULATION;

D O I：

10.1051/0004-6361/201220699

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We aim to show the importance of non-elastic excitation and deexcitation processes in He*(n) + He(1s(2)) collisions with the principal quantum number n >= 3 for helium-rich white dwarf atmospheres. We compare the efficiencies of these processes with those of the known non-elastic electron-He*(n) atom processes in the atmospheres of some DB white dwarfs. We show that in significant parts of the considered atmospheres, which contain weakly ionized layers (the ionization degree less than or similar to 10(-3)), the influence of the studied atom-Rydberg atom processes on excited helium atom populations is dominant or at least comparable to the influence of the concurrent electron-He*(n)-atom processes.

引用

页数：3

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