The Importance of Collisional Coupling among High-Energy Pseudometastable Levels of Fe II Excited by Lyα

Details The Importance of Collisional Coupling among High-Energy Pseudometastable Levels of Fe II Excited by Lyα The Importance of Collisional Coupling among High-Energy Pseudometastable Levels of Fe II Excited by Lyα

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...604l.129b&link_type=abstract

The Astrophysical Journal, Volume 604, Issue 2, pp. L129-L132.

Astronomy and Astrophysics

Astronomy

5

Atomic Data, Atomic Processes, Galaxies: Active, Line: Formation, Stars: Novae, Cataclysmic Variables, Stars: Individual: Constellation Name: Η Carinae

Scientific paper

We study the effects of high-energy pseudometastable levels in modeling Fe II spectra excited by Lyα fluorescence. We demonstrate that collisional couplings between metastable- and radiative-emitting levels are of fundamental importance in the formation of the spectrum under a wide range of physical conditions that encompass most astronomical fluorescent Fe II sources. Electron-impact-induced transitions from metastable levels strengthen the overall emission spectra and, in particular, strengthen the lines that results from secondary decay after Lyα pumping, like the so-called ``1 μm lines.''

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