SIMBAD references

2000A&A...362..730C - Astronomy and Astrophysics, volume 362, 730-736 (2000/10-2)

Emission lines of OIII in the optical and ultraviolet spectra of planetary nebulae.

CRAWFORD F.L., KEENAN F.P., AGGARWAL K.M., WICKSTEAD A.W., ALLER L.H. and FEIBELMAN W.A.

Abstract (from CDS):

Recent R-matrix calculations of electron impact excitation rates in OIII are used to calculate electron temperature and density-dependent emission line ratios R1=I(4363Å)/I(4960Å+5007Å), R2=I(1661Å+1667Å)/I(4960Å+5007Å) and R3=I(2322Å)/I(1661Å+1667Å), for a range of electron temperatures (7500≤Te≤30000K) and densities (104≤Ne≤107cm–3) applicable to gaseous nebulae. The ratio-ratio diagrams (R1, R2) and (R1, R3) should, in principle, allow the simultaneous determination of Te and Ne from measurements of the OIII features in a spectrum. Plasma parameters derived for a sample of mid- to high-excitation planetary nebulae from (R1, R2) and (R1, R3) measurements, produced using a combination of ultraviolet spectra obtained with the International Ultraviolet Explorer (IUE) and optical data from a number of observing runs, are found to show excellent internal consistency. They also show, in general, good agreement with the values of Te and Ne estimated from other line ratios in the nebulae, therefore providing observational support for the accuracy of the theoretical ratios and hence the atomic data adopted in their derivation.

Abstract Copyright:

Journal keyword(s): atomic data - ISM: planetary nebulae: general

Simbad objects: 10

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2020.01.22-08:38:10

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