Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-02-19
Astronomy and Astrophysics
Astrophysics
9 pages, 4 figs., Invited Review, Proc. of IAU Symposium 209 on 'Planetary nebulae, their role in the Universe', Canberra, Aus
Scientific paper
A hot central star illuminating the surrounding ionized H II region usually produces very rich atomic spectra resulting from basic atomic processes: photoionization, electron-ion recombination, bound-bound radiative transitions, and collisional excitation of ions. Precise diagnostics of nebular spectra depend on accurate atomic parameters for these processes. Latest developments in theoretical computations are described, especially under two international collaborations known as the Opacity Project (OP) and the Iron Project (IP), that have yielded accurate and large-scale data for photoionization cross sections, transition probabilities, and collision strengths for electron impact excitation of most astrophysically abundant ions. As an extension of the two projects, a self-consistent and unified theoretical treatment of photoionization and electron-ion recombination has been developed where both the radiative and the dielectronic recombination processes are considered in an unified manner. Results from the Ohio State atomic-astrophysics group, and from the OP and IP collaborations, are presented. A description of the electronic web-interactive database, TIPTOPBASE, with the OP and the IP data, and a compilation of recommended data for effective collision strengths, is given.
No associations
LandOfFree
Atomic Processes in 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 Atomic Processes in Planetary Nebulae, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Atomic Processes in Planetary Nebulae will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-303081