J/A+A/376/1113 Line ratios for helium-like ions (Porquet+, 2001) ================================================================================ Line ratios for helium-like ions: Applications to collision-dominated plasmas. Porquet D., Mewe R., Dubau J., Raassen A.J.J., Kaastra J.S. =2001A&A...376.1113P ================================================================================ ADC_Keywords: Atomic physics Keywords: X-rays: stars - atomic processes - stars: coronae - stars: late-type - stars: activity - early-type stars: activity Description: The tables include data concerning six He-like ions: wavelengths, transition probabilities, wavelengths at which the radiation temperatures should be determined. Line ratios (G and R, see definition in table 1 below) for six He-like ions from Tables 3 to 69 for various parameters: density (n_e_), temperature (T_e_), dilution factor (W), radiation temperature (T_rad_), and spectral resolution. Atomic data (appendix A) concerning the unresolved satellite lines are displayed (from Tables A1 to A6). File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file gline.dat 43 610 G line intensity ratio (tables 4 to 9) rline.dat 44 21480 R line intensity ratios for W=0.5, 0.01, 0.01 (tables 10 to 69) taba1-3.dat 74 47 Atomic data of the dielectronic satellite lines (1s2l2l'-1s^2^2l'') for Ne IX, Mg XI and Si XIII (tables A1 to A3) taba4-6.dat 73 262 Atomic data related to the dielectronic satellite lines of type 1s2l nl'- 1s^2^nl'' for n=3 and 4 for Ne IX, Mg XI and Si XIII (tables A4 to A6) -------------------------------------------------------------------------------- Table 1: Wavelengths (in {AA}) of the three main lines of six He-like ions ------------------------------------------------------------------------ Type Label CV NVI OVII NeIX MgXI SiXIII 0.1nm 0.1nm 0.1nm 0.1nm 0.1nm 0.1nm ------------------------------------------------------------------------ resonance w 40.279 28.792 21.603 13.447 9.1681 6.6471 intercombination x 40.711 29.074 21.796 13.548 9.2267 6.6838 intercombination y 40.714 29.076 21.799 13.551 9.2298 6.6869 forbidden z 41.464 29.531 22.095 13.697 9.3134 6.7394 ------------------------------------------------------------------------ Line ratios are defined as: G = (z+(x+y))/w, R = z/(x+y) ------------------------------------------------------------------------ Table 2: Update of the transition probabilities (in s^-1^) for the six He-like ions ------------------------------------ Transition probability of Ion z line y line ------------------------------------ CV 4.857E+01 2.900E+07 NVI 2.538E+02 1.380E+08 OVII 1.046E+03 5.800E+08 NeIX 1.090E+04 5.400E+09 MgXI 7.347E+04 3.448E+10 SiXIII 3.610E+05 1.497E+11 ------------------------------------ Table 3: Wavelengths (in {AA}) at which the radiation temperature should be determined ------------------------------------------------ Wavelengths Transition CV NVI OVII NeIX MgXI SiXIII ------------------------------------------------ f->i 2280 1906 1637 1270 1033 864 6->r 3542 2904 2454 1860 1475 1200 ------------------------------------------------ Byte-by-byte Description of file: gline.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 --- Z [6,14] Atomic number of the ion (G1) 4- 10 E7.3 cm-3 Ne Electronic density 12- 15 F4.1 MK Te Electronic temperature 17- 18 I2 kK Trad Radiative temperature 20- 23 F4.2 --- G G ratio for Te & Trad, G=(z+(x+y))/w 25- 43 A19 --- Inst Spectral resolution for the calculations (G2) -------------------------------------------------------------------------------- Byte-by-byte Description of file: rline.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 --- Z [6,14] Atomic number of the ion (G1) 4- 7 F4.2 --- W Dilution factor of the radiation field (1) 9- 15 E7.1 cm-3 Ne Electronic density 17- 20 F4.1 MK Te Electronic temperature 22- 25 F4.1 kK Trad Radiative temperature 27- 34 E8.2 --- R R ratio for Te and Trad, R = z/(x+y) 36- 44 A9 --- Inst Spectral resolution used for the calculations (G2) -------------------------------------------------------------------------------- Note (1): the dilution factor is given by W = 0.5 * (1 - sqrt(1 - r*/r)) where r is the distance from the center of the stellar source of radius r*. -------------------------------------------------------------------------------- Byte-by-byte Description of file: taba1-3.dat taba4-6.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 --- Z [10,14] Atomic number (G1) 4- 28 A25 --- Trans Blended satellite line transition 30- 33 A4 --- label Current name of the transition 35- 41 F7.4 0.1nm lambda Wavelength of the transition 43- 49 F7.4 10+12s-1 Ar Radiative probability 51- 57 F7.4 10+12s-1 sumAr Sum of the radiative probability 59- 66 F8.4 10+12s-1 Aa Auto-ionization probability 68- 74 F7.4 10+12s-1 F2(s) Line strength factor -------------------------------------------------------------------------------- Global notes: Note (G1): Ion considered: Z= 6: C V Z= 7: N VI Z= 8: O VII Z=10: Ne IX Z=12: Mg XI Z=14: Si XIII Note (G2): Spectral resolution: HETGS: High Energy Transmission Grating Spectrometer on board Chandra MEG wavelength range 2.5-31{AA} HEG wavelength range 1.2-15{AA} LETGS: Low Energy Transmission Grating Spectrometer on board Chandra Wavelength range 2-157{AA} RGS: Reflection Grating Spectrometer on board XMM-Newton Wavelength range 6-35{AA} -------------------------------------------------------------------------------- Acknowledgements: Delphine Porquet References: Porquet & Dubau, Paper I 2000A&AS..143..495P ================================================================================ (End) Patricia Bauer [CDS] 18-Sep-2001