Other
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apjs...88..329c&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 88, no. 1, p. 329-356.
Other
44
Electron Scattering, H Ii Regions, Optical Transition, Sulfur, Transition Probabilities, Ultraviolet Spectra, Active Galactic Nuclei, Collision Parameters, Coulomb Collisions, Eigenvalues, Electron Transitions, Io, Jupiter (Planet), Nebulae, Optical Thickness, Planetary Magnetospheres, Tables (Data), Toruses
Scientific paper
New calculations are reported for electron excitation collision strengths, rate coefficients, transition probabilities, and line ratios for the astrophysically important optical and UV lines in S II. The collision strengths are calculated in the close coupling approximation using the R-matrix method. The present calculations are more extensive than previous ones, including all transitions among the 12 lowest LS terms and the corresponding 28 fine-structure levels in the collisional-radiative model for S II. While the present rate coefficients for electron impact excitation are within 10-30 percent of the previous values for the low-lying optical transitions employed as density diagnostics of H II regions and nebulae, the excitation rates for the UV transitions 4S super 03/2 - 4Psub 1/2,3/2,5/2 differ significantly from earlier calculations, by up to factor of 2. We describe temperature and density sensitive flux ratios for a number of UV lines. The present UV results are likely to be of interest in a more accurate interpretation of S II emission from the Io plasma torus in the magnetosphere of Jupiter, as well as other UV sources observed from the IUE, ASTRO 1, and the HST.
Cai Wei
Pradhan Anil Kumar
No associations
LandOfFree
Excitation rate coefficients and line ratios for the optical and ultraviolet transitions in S II does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Excitation rate coefficients and line ratios for the optical and ultraviolet transitions in S II, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Excitation rate coefficients and line ratios for the optical and ultraviolet transitions in S II will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1561244