J/MNRAS/387/871SiVI atomic data and broadening effect (Hamdi+, 2008)

Atomic data and electron-impact broadening effect in DO white dwarf atmospheres: Si VI. Hamdi R., Nessib N.B., Milovanovic N., Popovic L.C., Dimitrijevic M.S., Sahal-Brechot S. <Mon. Not. R. Astron. Soc., 387, 871-882 (2008)> =2008MNRAS.387..871HADC_Keywords: Atomic physicsKeywords: atomic data - atomic processes - line: formation - stars: atmospheres - white dwarfsAbstract: Energy levels, electric dipole transition probabilities and oscillator strengths in five times ionized silicon have been calculated in intermediate coupling. The present calculations were carried out with the general purpose atomic structure program superstructure. The relativistic corrections to the non-relativistic Hamiltonian are taken into account through the Breit-Pauli approximation. We have also introduced a semi-empirical correction [term energy corrections (TEC)] for the calculation of the energy levels. These atomic data are used to provide semiclassical electron-, proton- and ionized helium-impact linewidths and shifts for 15 Si VI multiplet. Calculated results have been used to consider the influence of Stark broadening for DO white dwarf atmospheric conditions.Description: In this work, the calculations were carried out with the general purpose atomic structure program superstructure (Eissner, Jones & Nussbaumer, 1974, Comput. Phys. Commun., 8, 270), as modified by Nussbaumer & Storey (1978A&A....64..139N). The atomic model used to calculate energies of terms or levels and transition probabilities include 26 configurations: 2s^{2}2p^{5}, 2s2p^{6}, 2s^{2}2p^{4}3l, 2s^{2}2p^{4}4l, 2s^{2}2p^{4}5l, 2s^{2}2p^{4}6l, 2s2p^{5}3l and 2p^{6}3l (l≤n-1).File Summary:

FileName Lrecl Records Explanations

ReadMe 80 . This file table2.dat 53 117 Energy levels for SiVI table3.dat 82 287 Transition probabilities, calculated wavelengths, and weighted oscillator strengths for SiVI spectrum table4.dat 112 75 Electron-, proton- and singly charged helium-impact broadening parameters for SiVI lines calculated using superstructure oscillator strength, for a perturber density of 10^{17}cm-3 and temperature of 50000 to 800000K

See also: J/A+AS/105/245 : Stark broadening AlXI and SiXII (Dimitrijevic+ 1994) J/A+AS/129/155 : SiXI + SiXIII lines Stark broadening (Dimitrijevic+ 1998) J/A+A/423/397 : Stark broadening of SiV (Ben Nessib+, 2004)Byte-by-byte Description of file: table2.dat

Bytes Format Units Label Explanations

1- 3 I3 --- Level [1,117] Level number 5- 18 A14 --- Conf Configuration 19- 25 A7 --- LS LS term (^{o}designation odd level) 27- 29 A3 --- J J value of the level 31- 37 I7 cm-1 E9conf Energy level calculated with nine-configuration model 39- 45 I7 cm-1 E26conf Energy level calculated with 26-configuration model 47- 53 I7 cm-1 ENIST ? Energy level from NIST

Byte-by-byte Description of file: table3.dat

Bytes Format Units Label Explanations

1- 2 I2 --- i Transition lower level 3 A1 --- --- [-] 4- 5 I2 --- j Transition upper level 7- 14 F8.3 0.1nm lambda Wavelength 16- 24 E9.4 s-1 Aij Present work transition probability value 26- 34 E9.4 s-1 AijFF ? FF transition probability value (1) 36- 43 E8.3 s-1 AijNIST ? NIST transition probability value 45- 53 E9.4 --- gf Present work weighted oscillator strength 55- 63 E9.4 --- gfFF ? FF weighted oscillator strength (1) 65- 73 E9.4 --- gfNIST ? NIST weighted oscillator strength 75- 82 E8.3 --- gfCT ? CT weighted oscillator strength (2)

Note (1): From Froese Fischer & Tachiev, 2004, At. Data Nucl. Data Tables, 87, 1Note (2): From Coutinho & Trigueiros, 1999, Cat. J/ApJS/121/591

Byte-by-byte Description of file: table4.dat

Bytes Format Units Label Explanations

1- 13 A13 --- Trans Transition 15- 20 F6.1 0.1nm lambda Averaged wavelength for the multiplet 23- 30 E8.3 --- C C parameter (1) 33- 38 I6 K T Temperature 41- 49 E9.4 --- We Electron-impact full Stark width at half-maximum 51- 60 E10.4 --- de Electron-impact Stark shift 62- 70 E9.4 --- WH+ Proton-impact full Stark width at half-maximum 72- 81 E10.4 --- dH+ Proton-impact Stark shift 83- 91 E9.4 --- WHe+ Singly charged helium-impact full Stark width at half-maximum 93-102 E10.4 --- dHe+ Singly charged helium-impact Stark shift 104-112 E9.4 --- WMSE Electron-impact full Stark width at half-maximum (2)

Note (1): This parameter when divided with the corresponding Stark width gives an estimate for the maximal perturber density for which the line may be treated as isolated.Note (2): calculated by Dimitrijevic (1993A&AS..100..237D) using modified semi-empirical formula (Dimitrijevic & Konjevic, 1980, J. Quant. Spectrosc. Radiat. Transfer, 24, 451)

History: From electronic version of the journal(End)Patricia Vannier [CDS] 10-Aug-2009

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