The FERRUM Project: Experimental transition probabilities of [Fe II] and astrophysical applications

Henrik Hartman; A. Derkatch; M. P. Donnelly; T. Gull; A. Hibbert; Sveneric Johansson; Hans Lundberg; S Mannervik; L.-O. Norlin; D. Rostohar; P. Royen; P. Schef

doi:10.1051/0004-6361:20021557

The FERRUM Project: Experimental transition probabilities of [Fe II] and astrophysical applications

Henrik Hartman, A. Derkatch, M. P. Donnelly, T. Gull, A. Hibbert, Sveneric Johansson, Hans Lundberg, S Mannervik, L.-O. Norlin, D. Rostohar, P. Royen, P. Schef

Atomic Physics

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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 a4G9/2 and b2H11/2and A-values for 13 forbidden transitions froma6S5/2, a4G9/2 andb4D7/2 in the optical region. A discrepancybetween the measured and calculated values of the lifetime for theb2H11/2 level is discussed in terms of levelmixing. We have used the code CIV3 to calculate transitionprobabilities of the a6D-a6S 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.

Original language	English
Pages (from-to)	1143-1149
Journal	Astronomy & Astrophysics
Volume	397
Issue number	3
DOIs	https://doi.org/10.1051/0004-6361:20021557
Publication status	Published - 2003

Subject classification (UKÄ)

Astronomy, Astrophysics and Cosmology

Free keywords

atomic data
stars: individual: Eta Carinae
ISM: dust
extinction

Access to Document

10.1051/0004-6361:20021557

Hartman_EDP2003

1 Doctoral Thesis (compilation)

Anomalous Spectral Lines in Space and Laboratory Plasmas - Studies with HST and CRYRING
Hartman, H., 2003, Lund Observatory, Lund University. 176 p.
Research output: Thesis › Doctoral Thesis (compilation)

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title = "The FERRUM Project: Experimental transition probabilities of [Fe II] and astrophysical applications",

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 a4G9/2 and b2H11/2and A-values for 13 forbidden transitions froma6S5/2, a4G9/2 andb4D7/2 in the optical region. A discrepancybetween the measured and calculated values of the lifetime for theb2H11/2 level is discussed in terms of levelmixing. We have used the code CIV3 to calculate transitionprobabilities of the a6D-a6S 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.",

keywords = "atomic data, stars: individual: Eta Carinae, ISM: dust, extinction",

author = "Henrik Hartman and A. Derkatch and Donnelly, {M. P.} and T. Gull and A. Hibbert and Sveneric Johansson and Hans Lundberg and S Mannervik and L.-O. Norlin and D. Rostohar and P. Royen and P. Schef",

year = "2003",

doi = "10.1051/0004-6361:20021557",

language = "English",

volume = "397",

pages = "1143--1149",

journal = "Astronomy & Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

number = "3",

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TY - JOUR

T1 - The FERRUM Project: Experimental transition probabilities of [Fe II] and astrophysical applications

AU - Hartman, Henrik

AU - Derkatch, A.

AU - Donnelly, M. P.

AU - Gull, T.

AU - Hibbert, A.

AU - Johansson, Sveneric

AU - Lundberg, Hans

AU - Mannervik, S

AU - Norlin, L.-O.

AU - Rostohar, D.

AU - Royen, P.

AU - Schef, P.

PY - 2003

Y1 - 2003

N2 - 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 a4G9/2 and b2H11/2and A-values for 13 forbidden transitions froma6S5/2, a4G9/2 andb4D7/2 in the optical region. A discrepancybetween the measured and calculated values of the lifetime for theb2H11/2 level is discussed in terms of levelmixing. We have used the code CIV3 to calculate transitionprobabilities of the a6D-a6S 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.

AB - 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 a4G9/2 and b2H11/2and A-values for 13 forbidden transitions froma6S5/2, a4G9/2 andb4D7/2 in the optical region. A discrepancybetween the measured and calculated values of the lifetime for theb2H11/2 level is discussed in terms of levelmixing. We have used the code CIV3 to calculate transitionprobabilities of the a6D-a6S 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.

KW - atomic data

KW - stars: individual: Eta Carinae

KW - ISM: dust

KW - extinction

U2 - 10.1051/0004-6361:20021557

DO - 10.1051/0004-6361:20021557

M3 - Article

SN - 0004-6361

VL - 397

SP - 1143

EP - 1149

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

IS - 3

ER -

The FERRUM Project: Experimental transition probabilities of [Fe II] and astrophysical applications

Abstract

Subject classification (UKÄ)

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Research output

Anomalous Spectral Lines in Space and Laboratory Plasmas - Studies with HST and CRYRING

Cite this