The FERRUM Project: Experimental transition probabilities of [Fe II] and astrophysical applications
Hartman, Henrik LU
; Derkatch, A.
; Donnelly, M. P.
; Gull, T.
; Hibbert, A.
; Johansson, Sveneric
LU
; Lundberg, Hans
LU
; Mannervik, S
; Norlin, L.-O.
and Rostohar, D.
, et al.
(2003)
In Astronomy & Astrophysics
397(3).
p.1143-1149
- Abstract
- We report on experimental transition probabilities for thirteenforbidden [Fe II] lines originating from three different metastable FeIi levels. Radiative lifetimes have been measured of two metastablestates by applying a laser probing technique on a stored ion beam.Branching ratios for the radiative decay channels, i.e. M1 and E2transitions, are derived from observed intensity ratios of forbiddenlines in astrophysical spectra and compared with theoretical data. Thelifetimes and branching ratios are combined to derive absolutetransition probabilities, A-values.We present the first experimental lifetime values for the two Fe IIlevels a<SUP>4</SUP>G<SUB>9/2</SUB> and... (More)
- We report on experimental transition probabilities for thirteenforbidden [Fe II] lines originating from three different metastable FeIi levels. Radiative lifetimes have been measured of two metastablestates by applying a laser probing technique on a stored ion beam.Branching ratios for the radiative decay channels, i.e. M1 and E2transitions, are derived from observed intensity ratios of forbiddenlines in astrophysical spectra and compared with theoretical data. Thelifetimes and branching ratios are combined to derive absolutetransition probabilities, A-values.We present the first experimental lifetime values for the two Fe IIlevels a<SUP>4</SUP>G<SUB>9/2</SUB> and b<SUP>2</SUP>H<SUB>11/2</SUB>and A-values for 13 forbidden transitions froma<SUP>6</SUP>S<SUB>5/2</SUB>, a<SUP>4</SUP>G<SUB>9/2</SUB> andb<SUP>4</SUP>D<SUB>7/2</SUB> in the optical region. A discrepancybetween the measured and calculated values of the lifetime for theb<SUP>2</SUP>H<SUB>11/2</SUB> level is discussed in terms of levelmixing. We have used the code CIV3 to calculate transitionprobabilities of the a<SUP>6</SUP>D-a<SUP>6</SUP>S transitions.We have also studied observational branching ratios for lines from 5other metastable Fe II levels and compared them to calculated values. Aconsistency in the deviation between calibrated observational intensityratios and theoretical branching ratios for lines in a wider wavelengthregion supports the use of [Fe II] lines for determination of reddening. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/130609
- author
- Hartman, Henrik
LU
; Derkatch, A.
; Donnelly, M. P.
; Gull, T.
; Hibbert, A.
; Johansson, Sveneric
LU
; Lundberg, Hans
LU
; Mannervik, S
; Norlin, L.-O.
and Rostohar, D.
, et al. (More)
- Hartman, Henrik
LU
; Derkatch, A.
; Donnelly, M. P.
; Gull, T.
; Hibbert, A.
; Johansson, Sveneric
LU
; Lundberg, Hans
LU
; Mannervik, S
; Norlin, L.-O.
; Rostohar, D.
; Royen, P.
and Schef, P.
(Less)
- organization
- publishing date
- 2003
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- atomic data, stars: individual: Eta Carinae, ISM: dust, extinction
- in
- Astronomy & Astrophysics
- volume
- 397
- issue
- 3
- pages
- 1143 - 1149
- publisher
- EDP Sciences
- external identifiers
-
- wos:000180249800041
- scopus:0037249906
- ISSN
- 0004-6361
- DOI
- 10.1051/0004-6361:20021557
- language
- English
- LU publication?
- yes
- id
- 7416faee-50c5-41ea-9ec3-0a405c0087b7 (old id 130609)
- date added to LUP
- 2016-04-01 17:15:15
- date last changed
- 2024-01-11 23:28:03
@article{7416faee-50c5-41ea-9ec3-0a405c0087b7,
abstract = {{We report on experimental transition probabilities for thirteenforbidden [Fe II] lines originating from three different metastable FeIi levels. Radiative lifetimes have been measured of two metastablestates by applying a laser probing technique on a stored ion beam.Branching ratios for the radiative decay channels, i.e. M1 and E2transitions, are derived from observed intensity ratios of forbiddenlines in astrophysical spectra and compared with theoretical data. Thelifetimes and branching ratios are combined to derive absolutetransition probabilities, A-values.We present the first experimental lifetime values for the two Fe IIlevels a<SUP>4</SUP>G<SUB>9/2</SUB> and b<SUP>2</SUP>H<SUB>11/2</SUB>and A-values for 13 forbidden transitions froma<SUP>6</SUP>S<SUB>5/2</SUB>, a<SUP>4</SUP>G<SUB>9/2</SUB> andb<SUP>4</SUP>D<SUB>7/2</SUB> in the optical region. A discrepancybetween the measured and calculated values of the lifetime for theb<SUP>2</SUP>H<SUB>11/2</SUB> level is discussed in terms of levelmixing. We have used the code CIV3 to calculate transitionprobabilities of the a<SUP>6</SUP>D-a<SUP>6</SUP>S transitions.We have also studied observational branching ratios for lines from 5other metastable Fe II levels and compared them to calculated values. Aconsistency in the deviation between calibrated observational intensityratios and theoretical branching ratios for lines in a wider wavelengthregion supports the use of [Fe II] lines for determination of reddening.}},
author = {{Hartman, Henrik and Derkatch, A. and Donnelly, M. P. and Gull, T. and Hibbert, A. and Johansson, Sveneric and Lundberg, Hans and Mannervik, S and Norlin, L.-O. and Rostohar, D. and Royen, P. and Schef, P.}},
issn = {{0004-6361}},
keywords = {{atomic data; stars: individual: Eta Carinae; ISM: dust; extinction}},
language = {{eng}},
number = {{3}},
pages = {{1143--1149}},
publisher = {{EDP Sciences}},
series = {{Astronomy & Astrophysics}},
title = {{The FERRUM Project: Experimental transition probabilities of [Fe II] and astrophysical applications}},
url = {{https://lup.lub.lu.se/search/files/4921364/624164.pdf}},
doi = {{10.1051/0004-6361:20021557}},
volume = {{397}},
year = {{2003}},
}