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

Astronomy and Astrophysics – Astronomy

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

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.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Auroral and nebular emission lines of [SII] in the optical spectra of planetary nebulae 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 Auroral and nebular emission lines of [SII] in the optical spectra of planetary nebulae, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Auroral and nebular emission lines of [SII] in the optical spectra of planetary nebulae will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-773820

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.