Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996sao..rept.....r&link_type=abstract
Technical Report, Smithsonian Astrophysical Observatory Cambridge, MA United States
Astronomy and Astrophysics
Astrophysics
X Ray Stars, Plasma Jets, Electromagnetic Absorption, X Ray Detectors, X Ray Density Measurement
Scientific paper
In this reporting period we have concentrated on evaluating the available collision strength and dielectronic recombination data and on incorporating the iron L-shell collision strengths of Duane Liedahl (computed with HULLAC) in the code. We have published the first major results, an evaluation of the M-shell collisional data for iron based on SERTS and EUVE data. We have critically compared the existing X-ray emission codes as a follow-on to the Napa HEAD meeting in 1994. We are using ASCA spectra and EUVE spectra to further test the reliability of the codes by testing whether a single set of model parameters can account for the entire observed spectrum. We have written a review of the emission spectra of hot astrophysical plasmas emphasizing some lesser-known processes. We have also considered the effects of non-Maxwellian electron velocity distributions on emission line spectra. N. Brickhouse presented a colloquium on the use of spectral models for EUV Astrophysics at Auburn U in February 1995. All three of us participated actively in the Rates, Codes, & Astrophysics Workshop in July 1995, sponsored by the AXAF Science Center, serving on the organizing committee, chairing a session on atomic rate uncertainties, and presenting papers on photoionized plasmas and spectral fitting approaches.
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