Benchmarking atomic data for astrophysics: Fe XVII EUV lines
DAMTP, Centre for Mathematical Sciences, Wilberforce road, Cambridge, CB3 0WA, UK e-mail: GDelZanna@spd.aas.org
2 Department of Chemistry, University of Puerto Rico, PO Box 23346, San Juan, PR 00931-3346, USA
Accepted: 1 October 2009
In the light of accurate structure and scattering calculations for , we review the status of identifications in the EUV spectrum of this ion using various experimental data, from the X-rays to the UV. Most previous identifications are confirmed, although a critical revision leads to changes in many wavelength values, in particular for the 2p5 3s–2p5 3p and 2p5 3p–2p5 3d transitions, which we observed with the Hinode EUV Imaging Spectrometer (EIS). Several lines are identified here for the first time. We find good agreement between expected and measured line intensities, with a few notable exceptions. In particular, the strong line in the EIS spectra, observed at 254.88 Å, has a consistently low observed intensity. We present two Hinode/EIS observations and discuss which lines are clearly blended in these datasets, and which are reliable for diagnostic purposes.
Key words: atomic data / line: identification
© ESO, 2009