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Bowen excitation of NIII lines in symbiotic stars

Eriksson, Mattias LU ; Johansson, Sveneric LU ; Wahlgren, Glenn LU ; Veenhuizen, H; Munari, U and Siviero, A (2005) In Astronomy & Astrophysics 434(2). p.397-404
Abstract
We present a semi-empirical equation for prediction of the strengths of those N III lines that are generated by the Bowen mechanism and observed in spectra of symbiotic stars. The equation assumes that the Bowen mechanism is the only source populating the 3d state in N III, and comparisons with observations of the 3s-3p and 3p-3d transitions serve as a test of this assumption. In an ongoing study of symbiotic stars the equation has been applied to two symbiotic novae, RR Tel and AG Peg, by comparing the predicted N III line strengths to observed line intensities. It is clear that besides the Bowen mechanism there is another process, most likely radiative recombination, that contributes to the N III 3d population in AG Peg and is the main... (More)
We present a semi-empirical equation for prediction of the strengths of those N III lines that are generated by the Bowen mechanism and observed in spectra of symbiotic stars. The equation assumes that the Bowen mechanism is the only source populating the 3d state in N III, and comparisons with observations of the 3s-3p and 3p-3d transitions serve as a test of this assumption. In an ongoing study of symbiotic stars the equation has been applied to two symbiotic novae, RR Tel and AG Peg, by comparing the predicted N III line strengths to observed line intensities. It is clear that besides the Bowen mechanism there is another process, most likely radiative recombination, that contributes to the N III 3d population in AG Peg and is the main population process of this state in RR Tel. It is also clear that a second, not previously considered, N III channel, 2p P-2(1/2)-3d D-2(3/2) at 374.198 angstrom, is pumped by O III in both RR Tel and AG Peg. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
binaries : symbiotic, atomic processes, line : formation
in
Astronomy & Astrophysics
volume
434
issue
2
pages
397 - 404
publisher
EDP Sciences
external identifiers
  • wos:000228326900001
  • scopus:18344387924
ISSN
0004-6361
DOI
10.1051/0004-6361:20042174
language
English
LU publication?
yes
id
e33c2aa0-c07a-4689-b1e3-34640047c65b (old id 243813)
date added to LUP
2007-08-06 14:25:47
date last changed
2017-01-01 07:19:21
@article{e33c2aa0-c07a-4689-b1e3-34640047c65b,
  abstract     = {We present a semi-empirical equation for prediction of the strengths of those N III lines that are generated by the Bowen mechanism and observed in spectra of symbiotic stars. The equation assumes that the Bowen mechanism is the only source populating the 3d state in N III, and comparisons with observations of the 3s-3p and 3p-3d transitions serve as a test of this assumption. In an ongoing study of symbiotic stars the equation has been applied to two symbiotic novae, RR Tel and AG Peg, by comparing the predicted N III line strengths to observed line intensities. It is clear that besides the Bowen mechanism there is another process, most likely radiative recombination, that contributes to the N III 3d population in AG Peg and is the main population process of this state in RR Tel. It is also clear that a second, not previously considered, N III channel, 2p P-2(1/2)-3d D-2(3/2) at 374.198 angstrom, is pumped by O III in both RR Tel and AG Peg.},
  author       = {Eriksson, Mattias and Johansson, Sveneric and Wahlgren, Glenn and Veenhuizen, H and Munari, U and Siviero, A},
  issn         = {0004-6361},
  keyword      = {binaries : symbiotic,atomic processes,line : formation},
  language     = {eng},
  number       = {2},
  pages        = {397--404},
  publisher    = {EDP Sciences},
  series       = {Astronomy & Astrophysics},
  title        = {Bowen excitation of NIII lines in symbiotic stars},
  url          = {http://dx.doi.org/10.1051/0004-6361:20042174},
  volume       = {434},
  year         = {2005},
}