The FERRUM Project: Oscillator Strengths of the Iron Group Elements: Fe II
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چکیده
منابع مشابه
The FERRUM Project: Experimental oscillator strengths of the UV 8 multiplet and other UV transitions from the y6P levels of Fe II
We report on experimental branching fractions (BFs) for 19 transitions from the three 3d5(6S)4s4p(3P) y6P levels in Fe II, measured in Fourier transform spectra of a Penning discharge lamp and a hollow cathode lamp. The transition wavelengths span the interval between 1600 and 2850 Å. Absolute oscillator strengths ( f -values) have been derived by combining the BFs with experimental radiative l...
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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. To measure lifetimes for the 3d(G)4s a 4G11/2 and 3d (D)4s b 4D1/2 metastable levels in Fe ii and experime...
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We consider the oscillator group equipped with a biinvariant Lorentzian metric. Some geometrical properties of this space and the harmonicity properties of left-invariant vector fields on this space are determined. In some cases, all these vector fields are critical points for the energy functional restricted to vector fields. Left-invariant vector fields defining harmonic maps are...
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We discuss implementation of TOPbase and Iron Project opacities for stellar spectral codes. We use a technique employed by Peach, where a Boltzmann-averaged cross-section is calculated for selected temperatures, and the opacity obtained from double interpolation in temperature and wavelength. It is straightforward to include all levels for which cross-sections have been calculated. Boltzmann-av...
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ژورنال
عنوان ژورنال: Highlights of Astronomy
سال: 2002
ISSN: 1539-2996
DOI: 10.1017/s1539299600012910