2009A&A...495..359K


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.10CET19:32:55

2009A&A...495..359K - Astronomy and Astrophysics, volume 495, 359-362 (2009/2-3)

Ultraviolet and extreme-ultraviolet line ratio diagnostics for OIV.

KEENAN F.P., CROCKETT P.J., AGGARWAL K.M., JESS D.B. and MATHIOUDAKIS M.

Abstract (from CDS):

We generate theoretical ultraviolet and extreme-ultraviolet emission line ratios for OIV and show their strong versatility as electron temperature and density diagnostics for astrophysical plasmas. Recent fully relativistic calculations of radiative rates and electron impact excitation cross sections for OIV, supplemented with earlier data for A-values and proton excitation rates, are used to derive theoretical OIV line intensity ratios for a wide range of electron temperatures and densities. Diagnostic line ratios involving ultraviolet or extreme-ultraviolet transitions in OIV are presented, that are applicable to a wide variety of astrophysical plasmas ranging from low density gaseous nebulae to the densest solar and stellar flares. Comparisons with observational data, where available, show good agreement between theory and experiment, providing support for the accuracy of the diagnostics. However, diagnostics are also presented involving lines that are blended in existing astronomical spectra, in the hope this might encourage further observational studies at higher spectral resolution.

Abstract Copyright:

Journal keyword(s): atomic processes - Sun: UV radiation - planetary nebulae: general - ultraviolet: general

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* RR Tel Sy* 20 04 18.5382966387 -55 43 33.154224077 9.93 11.33 10.81     WN3-6.5+M3.5-7 513 0
2 NGC 7662 PN 23 25 53.6 +42 32 06   9.4 12     ~ 906 0

    Equat.    Gal    SGal    Ecl

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2019.12.10-19:32:55

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