Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21547608n&link_type=abstract
American Astronomical Society, AAS Meeting #215, #476.08; Bulletin of the American Astronomical Society, Vol. 42, p.524
Astronomy and Astrophysics
Astronomy
Scientific paper
In 1978, Sveneric Johansson published a comprehensive analysis of the spectrum of Fe II, consisting of about 3300 lines from 576 energy levels and covering the region 90 nm to 1120 nm. Since then, high-resolution grating and Fourier transform spectrometers have increased the number of lines by a factor of over 5, extended the wavelength region up to 5500 nm, and reduced the uncertainty of the wavelengths by an order of magnitude. Many of these spectra were recorded on spectrometers at Kitt Peak National Observatory, Imperial College, London, and NIST and are the same as those used for an analysis of Fe I (Nave et al. ApJ Suppl. Ser. 94, 221 (1994)). The interpretation of Fe II lines in these spectra occupied Sveneric Johansson for the rest of his life and the number of known Fe II energy levels now exceeds 1000. Almost all of these levels, including the very highest ones observed in the laboratory, give lines in astronomical spectra. Spectral lines of Fe II are responsible for over half the identified lines in some stellar spectra.
I shall present my current work to complete the analysis of the laboratory spectra of Fe II that was begun in collaboration with Sveneric Johansson over 15 years ago. The aim is to produce a comprehensive list of Fe II lines, based on high-resolution grating and Fourier transform spectra, covering wavelengths from 90 nm to 5500 nm. This list will consist of roughly 15000 Fe II lines from over 1000 energy levels. I shall describe the wavelength calibration of the spectra and discuss the wavelength of a line at 160.8 nm that is widely-used to detect possible changes in the fine-structure constant in the early Universe.
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