2000A&AS..147..111C


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.23CEST13:28:58

2000A&AS..147..111C - Astron. Astrophys., Suppl. Ser., 147, 111-128 (2000/November-2)

Atomic data from the Iron Project. XLIV. Transition probabilities and line ratios for Fe VI with fluorescent excitation in planetary nebulae.

CHEN G.X. and PRADHAN A.K.

Abstract (from CDS):

Relativistic atomic structure calculations for electric dipole (E1), electric quadrupole (E2) and magnetic dipole (M1) transition probabilities among the first 80 fine-structure levels of Fe VI, dominated by configurations 3d3, 3d24s, and 3d24p, are carried out using the Breit-Pauli version of the code SUPERSTRUCTURE. Experimental energies are used to improve the accuracy of these transition probabilities. Employing the 80-level collision-radiative (CR) model with these dipole and forbidden transition probabilities, and Iron Project R-matrix collisional data, we present a number of [Fe VI] line ratios applicable to spectral diagnostics of photoionized H II regions. It is shown that continuum fluorescent excitation needs to be considered in CR models in order to interpret the observed line ratios of optical [Fe VI] lines in planetary nebulae NGC 6741, IC 351, and NGC 7662. The analysis leads to parametrization of line ratios as function of, and as constraints on, the electron density and temperature, as well as the effective radiation temperature of the central source and a geometrical dilution factor. The spectral diagnostics may also help ascertain observational uncertainties. The method may be generally applicable to other objects with intensive background radiation fields, such as novae and active galactic nuclei. The extensive new Iron Project radiative and collisional calculations enable a consistent analysis of many line ratios for the complex iron ions.

Abstract Copyright:

Journal keyword(s): atomic data - line formation - stars: white dwarfs - ISM: H II regions: planetary nebulae

VizieR on-line data: <Available at CDS (J/A+AS/147/111): table2.dat table4.dat table6.dat>

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 IC 351 PN 03 47 32.9811922252 +35 02 48.633107981   13.11 12.27 14.35   Of(H) 249 0
2 NGC 2440 PN 07 41 54.91 -18 12 29.7   18.9       ~ 626 2
3 NGC 6741 PN 19 02 37.10 -00 26 56.7     9.6     ~ 339 0
4 EM* AS 373 Sy* 19 57 05.0184580246 +39 49 36.085051314         10.592 M6/8e 564 0
5 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
6 NGC 6884 PN 20 10 23.6401227444 +46 27 39.547818788   11.9 10.9     ~ 305 1
7 NGC 6886 PN 20 12 42.83 +19 59 22.6           ~ 311 0
8 NGC 7662 PN 23 25 53.6 +42 32 06   9.4 12     ~ 906 0

    Equat.    Gal    SGal    Ecl

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2019.10.23-13:28:58

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