Auroral and nebular emission lines of [SII] in the optical spectra of planetary nebulae

Details Auroral and nebular emission lines of [SII] in the optical spectra of planetary nebulae Auroral and nebular emission lines of [SII] in the optical spectra of planetary nebulae

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.281.1073k&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 281, Issue 3, pp. 1073-1080.

Astronomy and Astrophysics

Astronomy

61

Atomic Data, Planetary Nebulae: General

Scientific paper

R-matrix calculations of electron impact excitation rates among the 3s^23p^3 levels of SII are presented, which are found to be up to a factor ~2 different from those of Cai & Pradhan. The present results are subsequently used to calculate emission-line ratio-ratio diagrams involving the 4068-, 4076-, 6717- and 6730-A transitions, for a range of electron temperatures (T_e=5000-20000 K) and electron densities (N_e=10-10^5 cm^-3) appropriate to gaseous nebulae. These diagrams should, in principle, allow the simultaneous determination of T_e and N_e from measurements of the [SII] lines in a spectrum. Plasma parameters deduced for a sample of planetary nebulae, using observational data obtained with the Hamilton Echelle spectrograph on the 3-m Shane Telescope at Lick Observatory, are found to show excellent internal consistency, and to be in generally good agreement with the values of T_e and N_e estimated from other line ratios in the echelle spectra. These results provide observational support for the accuracy of the theoretical ratios, and hence the atomic data adopted in their derivation.

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