ADC/CDS Standard Document for Catalog:/journal_tables/A+AS/147/111/
ADC/CDS Standard Document for Catalog:| 1. Use the ADC Data Viewer Suite to visualize the data. |
|
| 2. Get the data files via anonymous FTP. (See Note.) |
|
J/A+AS/147/111 Iron Project. XLIV. Fe VI. (Chen+, 2000)
================================================================================
Iron Project. XLIV. Transition probabilities and line ratios for Fe VI
with fluorescent excitation in planetary nebulae
Chen G.-X., Pradhan A.K.
<Astron. Astrophys. Suppl. Ser. 147, 111 (2000)>
=2000A&AS..147..111C
================================================================================
ADC_Keywords: Atomic physics ; Planetary nebulae
Keywords: atomic data - line formation - stars: white dwarfs -
ISM: H II regions: planetary nebulae
Abstract:
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 3d^3^, 3d^2^4s, and 3d^2^4p, 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.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 39 80 The 80 fine structure levels corresponding to
the 34 LS terms included in the calculations
and their observed energies (Ry) in Fe VI
(Sugar & Corliss, 1985, Cat. <VI/74>)
table2.dat 33 867 Weighted dipole allowed E1 oscillator strengths
gf_L_, gf_V_ in the length and velocity
formulations, and the Einstein A-coefficients
A_L_ in the length formulation.
table3.dat 57 129 Comparison of the electric quadrupole (E2) and
magnetic dipole (M1) transition probabilities
between the first 19 levels of Fe VI in s^-1^
among the present calculation by SUPERSTRUCTURE,
calculations by Garstang et al.
(1978ApJ...222..384G) and by Nussbaumer & Storey
(1978A&A....70...37N)
table4.dat 24 1101 Electric quadrupole (E2) and magnetic dipole (M1)
transition probabilities between the first 80
levels of Fe VI in s^-1^ in the present
calculation by SUPERSTRUCTURE.
table6.dat 101 177 Line intensity ratios for transitions relative
to {lambda}5146{AA} (8-3: ^4^F_7/2_-^2^G_7/2_),
with T_eff_=150000K.
--------------------------------------------------------------------------------
See also:
VI/74 : Atomic Energy Level Data (NIST 1993)
J/A+AS/103/273 : IRON Project II IR collision strengths of C-like ions
J/A+A/283/319 : IRON Project III B-like ions
J/A+AS/108/1 : IRON Project V Collision strengths of O-like ions
J/A+A/293/953 : IRON Project VI Fe II collision strengths
J/A+A/293/967 : IRON Project VII Fe II radiative transitions
J/A+AS/109/193 : IRON Project VIII Electron excitation of Ti-like ions
J/A+AS/119/509 : IRON Project XVII Radiative transition in Fe III
J/A+AS/119/523 : IRON Project XVIII Electron impact for Fe III
J/A+AS/120/361 : IRON Project XIX Fe II radiative transitions
J/A+AS/123/159 : IRON Project XXII C and O radiative rates
J/A+AS/123/575 : IRON Project XXIII Fe XXII excitation rate coefficients
J/A+AS/126/373 : IRON Project XXVII Fe IV collision strengths
J/A+AS/131/499 : IRON Project XXIX Boron isoelectronic sequence
J/A+AS/131/153 : IRON Project XXXI Fe XII electron excitation
J/A+AS/135/347 : IRON Project XXXV Fe XXIV & Fe XXV oscillator strengths
J/A+AS/136/395 : IRON Project XXXVII Fe VI collision strengths
J/A+AS/137/165 : IRON Project XXXVIII Fe XV fine-structure transitions
J/A+AS/143/483 : IRON Project XLII Fe XXI electron impact excitation
J/A+AS/144/141 : IRON Project XLIII Fe V transition probabilities
J/A+AS/147/253 : IRON Project XLV Ar XIII, Fe XXI trans. probabilities
J/A+A/365/268 : IRON Project XLVII Ni III electron impact excitation
J/A+A/372/1078 : IRON Project XLIX Fe XX electron impact excitation
J/A+A/372/1083 : IRON Project L Fe XIX electron impact excitation
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- i Initial level
4- 24 A21 --- Term LS term
26- 27 I2 --- 2J Final 2J level
29- 36 F8.6 Ry E Observed energy (Sugar & Corliss,
1985, Cat. <VI/74>)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- i Initial level
4- 5 I2 --- j Final level
7- 14 E8.2 --- gfL E1 oscillator strength in the length formulation
16- 23 E8.2 --- gfV E1 oscillator strength in the velocity formulation
25- 32 E8.2 s-1 AL Einstein A-coefficient in the length formulation
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- i i Transition
4- 5 I2 --- j j Transition
7- 14 E8.2 s-1 E2 Present electric quadrupole transition probability
16- 23 E8.2 s-1 M1 Present magnetic dipole transition probability
25- 31 E7.2 s-1 E2G ? Garstang et al. (1978ApJ...222..384G)
electric quadrupole transition probability
32- 39 E8.2 s-1 M1G ? Garstang et al. (1978ApJ...222..384G)
magnetic dipole transition probability
42- 49 E8.2 s-1 E2N ? Nussbaumer & Storey (1978A&A....70...37N)
electric quadrupole transition probability
51- 58 E8.2 s-1 M1N ? Nussbaumer & Storey (1978A&A....70...37N)
magnetic dipole transition probability
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- i Initial level
4- 5 I2 --- j Final level
7- 14 E8.4 s-1 E2 Electric quadrupole transition probability
16- 23 E8.4 s-1 M1 Magnetic dipole transition probability
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- Trans Transition
6- 9 I4 0.1nm lambda Wavelength
11 A1 --- FLE [ABCDEO] Note on fluorescent excitation (1)
13- 19 E7.2 --- LIR1 ? Te=10000K, ne=10^3^cm-3 line intensity ratio
21- 27 E7.2 --- LIR2 ? Te=10000K, ne=10^4^cm-3 line intensity ratio
29- 35 E7.2 --- LIR3 ? Te=20000K, ne=10^3^cm-3 line intensity ratio
37- 43 E7.2 --- LIR4 ? Te=20000K, ne=10^4^cm-3 line intensity ratio
45- 51 E7.2 --- LIR5 ? Te=12000K, ne=2x10^3^cm-3 line intensity ratio
53- 59 E7.2 --- LIR6 ? Te=12000K, ne=6x10^3^cm-3 line intensity ratio
61- 67 E7.2 --- LIR7 ? Te=12000K, ne=10^4^cm-3 line intensity ratio
69- 75 E7.2 --- LIR8 ? Te=16000K, ne=2x10^3^cm-3 line intensity ratio
77- 83 E7.2 --- LIR9 ? Te=16000K, ne=6x10^3^cm-3 line intensity ratio
85- 91 E7.2 --- LIR10 ? Te=16000K, ne=10^4^cm-3 line intensity ratio
93- 99 E7.2 ---- LIR11 ? Line intensity ratio from r_LIR11
100 A1 --- r_LIR11 [a-f] Reference for LIR11 (2)
--------------------------------------------------------------------------------
Note (1): Fluorescent excitation (FLE) condition:
A: no FLE
B: FLE with W=5x10^-16^
C: FLE with W=5x10^-13^
D: FLE with W=5x10^-10^
E: From Nussbaumer and Storey (1978A&A....70...37N)
O: Observational values for various planetary nebulae (only LIR11)
Note (2): References for planetary nebulae line intensity ratio:
a: Hyung and Aller (1997ApJ...491..242H)
b: Hyung et al. (1995MNRAS.272...49H)
c: Hyung et al. (1997ApJS..108..503H)
d: Feibelman et al. (1996MNRAS.278..625F)
e: Hyung and Aller (1998PASP..110..466H)
f: Hyung and Aller (1997MNRAS.292...71H)
g: McKenna et al. (1997ApJ...486..571M)
--------------------------------------------------------------------------------
Acknowledgements: Guo-Xin Chen <chen@astronomy.ohio-state.edu>
References:
1993A&A...279..298H : IRON Project I Goal and methods
1994A&AS..107...29S : IRON Project IV Electron excitation of F-like ions
1995A&AS..110..209P : IRON Project IX Electron excitation of Cl-like ion
1995A&AS..111..347G : IRON Project X Si- & S-like ions IR coll. strengths
1996A&AS..115..151S : IRON Project XI Ar VI, K VII & CaVIII fine-structure
1995A&AS..114..367B : IRON Project XII V-like ions electron excitation
1996A&AS..115..551B : IRON Project XIII Ni II & Fe II electron excitation
1996A&A...309..677S : IRON Project XIV Fe XIV fine-structure transition
1996A&AS..118..157K : IRON Project XV He II & Fe XXVI Electron excitation
1996A&AS..119..105B : IRON Project XVI Fe V oscillator strengths
1997A&AS..122..167B : IRON Project XX Fe I oscillator strengths
1997A&AS..122..177P : IRON Project XXI Fe I fine-structure transition
1997A&AS..126..105B : IRON Project XXIV Fe XXIV electron excitation
1998A&AS..127..545B : IRON Project XXV Fe XII electron excitation
1997A&AS..126..365B : IRON Project XXVI Fe IV oscillator strengths
1998A&AS..129..161B : IRON Project XXVIII F-like ions fine-structure trans.
1999A&AS..134..369S : IRON Project XXX P III, S IV & Cl V collision data
1998A&AS..133..245G : IRON Project XXXII Ar III effective collision strength
1999A&AS..135..159M : IRON Project XXXIII Carbon radiative rates
1999A&AS..136..385E : IRON Project XXXIV Fe XVI electron impact excitation
1999A&AS..137..175C : IRON Project XXXVI Fe XXIII electron excitation
1999A&AS..137..529B : IRON Project XXXIX Ni II oscillator strengths
2000A&AS..141..285S : IRON Project XL Fe XIV electron excitation
2000A&AS..142..313B : IRON Project XLI Fe VII electron excitation
2001A&A...365..258P : IRON Project XLVI Fe X electron excitation
================================================================================
(End) Patricia Bauer [CDS] 05-Oct-2000