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The FERRUM project :
The FERRUM project : Transition probabilities for forbidden lines in [Fe II] and experimental metastable lifetimes
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- Gurell, Jonas, 1981- (author)
- Stockholms universitet,Fysikum,Department of Physics, Stockholm University, AlbaNova University Center, 10691 Stockholm, Sweden
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- Hartman, H. (author)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
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- Blackwell-Whitehead, Richard (author)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
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- Nilsson, Hampus (author)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
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- Bäckström, Erik, 1983- (author)
- Stockholms universitet,Fysikum,Department of Physics, Stockholm University, AlbaNova University Center, 10691 Stockholm, Sweden
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- Norlin, Lars-Olov (author)
- KTH,Fysik,Department of Physics, Royal Institute of Technology, AlbaNova University Center, 10691 Stockholm, Sweden
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- Royen, Peder (author)
- Stockholms universitet,Fysikum,Department of Physics, Stockholm University, AlbaNova University Center, 10691 Stockholm, Sweden
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- Mannervik, Sven (author)
- Stockholms universitet,Fysikum,Department of Physics, Stockholm University, AlbaNova University Center, 10691 Stockholm, Sweden
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(creator_code:org_t)
- 2009-10-15
- 2009
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 508:1, s. 525-529
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Abstract
Subject headings
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- Context. Accurate transition probabilities for forbidden lines are important diagnostic parameters for low-density astrophysical plasmas. In this paper we present experimental atomic data for forbidden [Fe II] transitions that are observed as strong features in astrophysical spectra. Aims. We measure lifetimes for the 3d(6)((3)G)4s a (4)G(11/2) and 3d(6)((3)D)4s b (4)D(1/2) metastable levels in Fe II and experimental transition probabilities for the forbidden transitions 3d(7) a (4)F(7/2,9/2)-3d(6)((3)G)4s a (4)G(11/2). Methods. The lifetimes were measured at the ion storage ring facility CRYRING using a laser probing technique. Astrophysical branching fractions were obtained from spectra of Eta Carinae, obtained with the Space Telescope Imaging Spectrograph onboard the Hubble Space Telescope. The lifetimes and branching fractions were combined to yield absolute transition probabilities. Results. The lifetimes of the a (4)G(11/2) and the b (4)D(1/2) levels have been measured and have the following values, tau = 0.75 +/- 0.10 s and tau = 0.54 +/- 0.03 s respectively. Furthermore, we have determined the transition probabilities for two forbidden transitions of a (4)F(7/2,9/2)-a (4)G(11/2) at 4243.97 and 4346.85 angstrom. Both the lifetimes and the transition probabilities are compared to calculated values in the literature.
Subject headings
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- atomic data
- methods: laboratory
- techniques: spectroscopic
- stars: individual: Eta Carinae
- Atomic physics
- Atomfysik
- Astronomy and astrophysics
- Astronomi och astrofysik
- fysik
- Physics
Publication and Content Type
- ref (subject category)
- art (subject category)
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