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

共 50 条

[11] Molecules in the atmospheres of helium-rich very cool white dwarfs
Aslan, T
Bues, I
KarlDietze, L
HYDROGEN DEFICIENT STARS, 1996, 96 : 325 - 325
[12] Analysis of IUE spectra of helium-rich white dwarf stars
Castanheira, B.G.
Kepler, S.O.
Handler, G.
Koester, D.
Astronomy and Astrophysics, 1600, 450 (01): : 331 - 337
[13] Analysis of IUE spectra of helium-rich white dwarf stars
Castanheira, BG
Kepler, SO
Handler, G
Koester, D
ASTRONOMY & ASTROPHYSICS, 2006, 450 (01): : 331 - 337
[14] EXCITATION TRANSFER IN ION-RYDBERG-ATOM COLLISIONS
OLSON, RE
PHYSICAL REVIEW A, 1981, 23 (06): : 3338 - 3340
[15] ATMOSPHERES OF HELIUM-RICH WHITE DWARFS OF SPECTRAL TYPE-DB
BUES, I
ASTRONOMY & ASTROPHYSICS, 1970, 7 (01) : 91 - +
[16] Non-ideal equation of state, refraction and opacities in very cool, helium-rich white dwarf atmospheres
Kowalski, PM
Saumon, D
Mazevet, S
14th European Workshop on White Dwarfs, Proceedings, 2005, 334 : 203 - 208
[17] A faint type of supernova from a white dwarf with a helium-rich companion
Perets, H. B.
Gal-Yam, A.
Mazzali, P. A.
Arnett, D.
Kagan, D.
Filippenko, A. V.
Li, W.
Arcavi, I.
Cenko, S. B.
Fox, D. B.
Leonard, D. C.
Moon, D. -S.
Sand, D. J.
Soderberg, A. M.
Anderson, J. P.
James, P. A.
Foley, R. J.
Ganeshalingam, M.
Ofek, E. O.
Bildsten, L.
Nelemans, G.
Shen, K. J.
Weinberg, N. N.
Metzger, B. D.
Piro, A. L.
Quataert, E.
Kiewe, M.
Poznanski, D.
NATURE, 2010, 465 (7296) : 322 - 325
[18] A faint type of supernova from a white dwarf with a helium-rich companion
H. B. Perets
A. Gal-Yam
P. A. Mazzali
D. Arnett
D. Kagan
A. V. Filippenko
W. Li
I. Arcavi
S. B. Cenko
D. B. Fox
D. C. Leonard
D.-S. Moon
D. J. Sand
A. M. Soderberg
J. P. Anderson
P. A. James
R. J. Foley
M. Ganeshalingam
E. O. Ofek
L. Bildsten
G. Nelemans
K. J. Shen
N. N. Weinberg
B. D. Metzger
A. L. Piro
E. Quataert
M. Kiewe
D. Poznanski
Nature, 2010, 465 : 322 - 325
[19] Symmetrical chemi-ionization and chemi-recombination processes in low-temperature layers of helium-rich DB white dwarf atmospheres
Mihajlov, AA
Ignjatovic, LM
Dimitrijevic, MS
Djuric, Z
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2003, 147 (02): : 369 - 377
[20] Analysis of the helium-rich magnetic white dwarf GD1072
Fey, W
Bues, I
HYDROGEN DEFICIENT STARS, 1996, 96 : 323 - 323

← 1 2 3 4 5 →