The K Spectrum of Iron L-Shell Ions in Photoionized Plasmas

Dr. Duane Liedahl

Lawrence Livermore National Lab
P. O. Box 808, L-473
Livermore, CA 94550

Advancements in detector capabilities, exemplified by the XRS on Astro-E 2, promise to uncover the spectral complexity in the iron K spectrum in several classes of celestial X-ray source, complexity that has been observed only in solar and laboratory plasmas thus far. I have calculated detailed atomic models that include the effects of inner-shell photoionization, autoionization, collisional excitation at relatively high particle number densities, and photoexcitation in plasmas with high X-ray and/or UV energy densities. The primary applications of these models are accretion disk atmospheres and winds in X-ray binaries.