Access to Astronomical Catalogues

← Click to display the menu
J/A+A/530/A18  Nebular NII lines effective recombination coeff.    (Fang+, 2013)

New effective recombination coefficients for nebular NII lines (Corrigedum). Fang X., Storey P.J., Liu X.-W. <Astron. Astrophys. 530, A18 (2011) and 550, C2 (2013)> =2011A&A...530A..18F +2013A&A...550C...2F
ADC_Keywords: Atomic physics Keywords: atomic data - line: formation - HII regions - ISM: atoms - planetary nebulae: general Abstract: In nebular astrophysics, there has been a long-standing dichotomy in plasma diagnostics between abundance determinations using the traditional method based on collisionally excited lines (CELs), on the one, hand and (optical) recombination lines/continuum, on the other. A number of mechanisms have been proposed to explain the dichotomy. Deep spectroscopy and recombination line analysis of emission line nebulae (planetary nebulae and HII regions) in the past decade have pointed to the existence of another previously unknown component of cold, H-deficient material as the culprit. Better constraints are needed on the physical conditions (electron temperature and density), chemical composition, mass, and spatial distribution of the postulated H-deficient inclusions in order to unravel their astrophysical origins. This requires knowledge of the relevant atomic parameters, most importantly the effective recombination coefficients of abundant heavy element ions such as CII, OII, NII, and NeII, appropriate for the physical conditions prevailing in those cold inclusions (e.g. Te≤1000K ). Description: Here we present a corrigendum published in A&A, 550, C2. Tables 3-15 are all corrected based on the revised atomic data. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 122 217 Case B effective recombination coefficients for electron density Ne=102cm-3 table4.dat 122 217 Case B effective recombination coefficients for electron density Ne=103cm-3 table5.dat 122 217 Case B effective recombination coefficients for electron density Ne=104cm-3 table6.dat 122 217 Case B effective recombination coefficients for electron density Ne=105cm-3 table7.dat 129 55 Fit parameters and the average and maximum fitting errors for 125≤Te≤20000K and Ne=102cm-3 for Case B recombination table8.dat 129 55 Fit parameters and the average and maximum fitting errors for 125≤Te≤20000K and Ne=103cm-3 for Case B recombination table9.dat 129 55 Fit parameters and the average and maximum fitting errors for 125≤Te≤20000K and Ne=104cm-3 for Case B recombination table10.dat 129 55 Fit parameters and the average and maximum fitting errors for 125≤Te≤20000K and Ne=105cm-3 for Case B recombination table11.dat 129 55 Fit parameters and the average and maximum fitting errors for 125≤Te≤20000K and Ne=102cm-3 for Case A recombination table12.dat 129 55 Fit parameters and the average and maximum fitting errors for 125≤Te≤20000K and Ne=103cm-3 for Case A recombination table13.dat 129 55 Fit parameters and the average and maximum fitting errors for 125≤Te≤20000K and Ne=104cm-3 for Case A recombination table14.dat 129 55 Fit parameters and the average and maximum fitting errors for 125≤Te≤20000K and Ne=105cm-3 for Case A recombination table15.dat 70 26 *Comparison of our direct recombination coefficients to states of N+ with those of Kisielius & Storey (2002, Cat. J/A+A/387/1135) and of Nahar (1995ApJS..101..423N)
Note on table15.dat: The comparison is for electron temperatures Te=1000 and 10000K, and electron density Ne=104cm-3.
See also: J/A+A/387/1135 : NII effective recombination coefficients (Kisielius+, 2002) Byte-by-byte Description of file: table3.dat table4.dat table5.dat table6.dat
Bytes Format Units Label Explanations
1- 21 A21 --- Tr General transition term (multiplet) 24- 54 A31 --- Trans Detailed transition 57- 64 F8.2 Angstrom lambda Transition wavelength λ 66 A1 --- n_lambda [*] experimentally known energies (1) 68- 74 E7.2 10-15cm3/s ERC1 Effective recombination coefficient αeff(λ) for Te=125K (2) 76- 82 E7.2 10-15cm3/s ERC2 Effective recombination coefficient αeff(λ) for Te=500K (2) 84- 90 E7.2 10-15cm3/s ERC3 Effective recombination coefficient αeff(λ) for Te=1000K (2) 92- 98 E7.2 10-15cm3/s ERC4 Effective recombination coefficient αeff(λ) for Te=5000K (2) 100-106 E7.2 10-15cm3/s ERC5 Effective recombination coefficient αeff(λ) for Te=10000K (2) 108-114 E7.2 10-15cm3/s ERC6 Effective recombination coefficient αeff(λ) for Te=15000K (2) 116-122 E7.2 10-15cm3/s ERC7 Effective recombination coefficient αeff(λ) for Te=20000K (2)
Note (1): * denotes this transition wavelength was derived from the experimentally known energies of the upper and lower states. Note (2): the Case B effective recombination coefficient αeff(λ) is defined by emissivity e(λ): e(λ) = N_e N_+ αeff(λ) hc/λ [e(λ) in erg/s/cm-3 = 100W/m3]
Byte-by-byte Description of file: table[7-9].dat table1[0-4].dat
Bytes Format Units Label Explanations
1- 27 A27 --- Trans Transition 30- 32 A3 --- Mult Multiplet 35- 41 F7.2 Angstrom lambda Wavelength of transition λ 43- 50 F8.4 --- a a coefficient (1) 52- 59 F8.4 --- b b coefficient (1) 61- 68 F8.4 --- c c coefficient (1) 70- 77 F8.4 --- d d coefficient (1) 79- 86 F8.4 --- e e coefficient (1) 88- 95 F8.4 --- f f coefficient (1) 97-104 F8.4 --- g g coefficient (1) 107-115 F9.6 --- h h coefficient (1) 118-122 F5.3 % del Average deviation of the fit (delta) 125-129 F5.3 % Del Maximum deviation of the fit Δ
Note (1): The expression of the effective recombination coefficient is log(αeff)+15 = a+b*t+c*t2+(d+e*t+f*t2)log(t)+g*(log(t))2+h/t, where t is the reduced electronic temperature Te/104K. table7.dat, table8.dat, table9.dat and table10.dat are fit results for Case B recombination; table11.dat, table12.dat, table13.dat and table14.dat are fit results for Case A recombination.
Byte-by-byte Description of file: table15.dat
Bytes Format Units Label Explanations
1- 15 A15 --- State State (1) 18- 25 E8.2 cm+3/s DRCN3 ?=- Nahar (1995ApJS..101..423N) direct recombination coefficient for Te=1000K 27- 34 E8.2 cm+3/s DRCK3 ?=- Kisielius & Storey (J/A+A/387/1135) direct recombination coefficient for Te=1000K 36- 43 E8.2 cm+3/s DRCP3 Present work direct recombination coefficient for Te=1000K 45- 52 E8.2 cm+3/s DRCN4 ?=- Nahar (1995ApJS..101..423N) direct recombination coefficient for Te=10000K 54- 61 E8.2 cm+3/s DRCK4 ?=- Kisielius & Storey (J/A+A/387/1135) direct recombination coefficient for Te=10000K 63- 70 E8.2 cm+3/s DRCP4 Present work direct recombination coefficient for Te=10000K
Note (1): Two last lines are for Sum and Total
Acknowledgements: Xuan Fan, fangx(at)pku.edu.cn History: * 29-Apr-2011: Original version * 01-Feb-2013: New files from erratum (from author)
(End) Patricia Vannier [CDS] 01-Feb-2013
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service

© UDS/CNRS

Contact