Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aps..dmp..l956k&link_type=abstract
American Physical Society, DAMOP Meeting, 14-June 17, 2000 Storrs, CT, abstract #L9.56
Astronomy and Astrophysics
Astronomy
Scientific paper
The high-quality spectra obtained from instruments on board the Chandra X-ray astronomy satellite, coupled with accurate atomic data, enable the evaluation of electron densities, temperatures and abundances in a variety of x-ray sources. Iron lines, from a wide range of ionization states, have particularly valuable diagnostic capabilities for high temperature plasmas. (N. S. Brickhouse, J. C. Raymond and B. W. Smith, Astrophys. J. Suppl. 97), 551 (1995). In combination with simultaneous observations by the Extreme Ultraviolet Explorer (EUVE), density diagnostics with both the Low Energy Transmission Grating (LETG) and the High Energy Transmission Grating (HETG) can be performed. We have carried out electron impact excitation calculations for Fe XX, using the R-matrix approach including relativistic effects with sophisticated configuration interaction wavefunctions to represent the 2s^22p^3, 2s2p^4 and 2s^22p^23s target states. For Δ n=0 transitions our rates, which have been calculated with the inclusion of resonance effects, are significantly different from those rates obtained using distorted wave methods, for the temperature range 5 <= log T <= 8. Further details and a comprehensive set of results will be presented at the meeting.
Kirby Kate Page
McLaughlin Brendan M.
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