RADIATIVE L-SHELL TRANSITIONS IN Fe XIX AND Fe XX IONS

Autor:	Kate Kirby, Nancy Brickhouse, M. Linnik, Svetlana Kotochigova
Rok vydání:	2009
Předmět:	Physics Wavelength Space and Planetary Science Radiative transfer Astronomy and Astrophysics Emission spectrum Atomic physics Perturbation theory Configuration interaction Spectral line L-shell Ion
Zdroj:	The Astrophysical Journal Supplement Series. 186:85-93
ISSN:	1538-4365 0067-0049
DOI:	10.1088/0067-0049/186/1/85
Popis:	We compute the wavelengths and oscillator strengths for the 3s, 3d → 2p, and 3p → 2s emission lines in Fe XIX and Fe XX ions by using a configuration interaction Dirac-Fock and Dirac-Fock-Sturm method combined with second-order Brillouin-Wigner perturbation theory. We provide a complete list of computed wavelengths and oscillator strengths in both the velocity and length gauge for these transitions, many of which have never previously been reported. A comparison of our data with laboratory measurements and other theoretical predictions allows us to estimate an uncertainty of ~2 mA in the wavelengths and an uncertainty of 2%-3% in the oscillator strengths. We expect that our calculations will provide a means of identifying emission lines from astrophysical sources and improve the ability to detect blending in X-ray grating spectra from Chandra and XMM-Newton. As an example, we present a simulated emission spectrum of Capella and find improved agreement between the observations and our calculations, compared with previous data sets.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1ebc0b1d544ac02d90b88ad613f1477c https://doi.org/10.1088/0067-0049/186/1/85 Zobrazit plný text záznamu