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J/MNRAS/357/471     Calculated spectra for HeH+            (Engel+, 2005)

Calculated spectra for HeH+ and its effect on the opacity of cool metal-poor stars. Engel E.A., Doss N., Harris G.J., Tennyson J. <Mon. Not. R. Astron. Soc., 357, 471-477 (2005)> =2005MNRAS.357..471E
ADC_Keywords: Atomic physics ; Opacities ; Radio lines Keywords: molecular data - plasmas - infrared: general Abstract: The wavelength and Einstein A coefficient are calculated for all rotation-vibration transitions of 4HeH+, 3HeH+, 4He2H+ and 3He2H+, giving a complete line list and the partition function for 4HeH+ and its isotopologues. This opacity is included in the calculation of the total opacity of low-metallicity stars and its effect is analysed for different conditions of temperature, density and hydrogen number fraction. For a low helium number fraction (as in the Sun), it is found that HeH+ has a visible but small effect for very low densities (ρ≤10-10g/cm3), at temperatures around 3500K. However, for high helium number fraction, the effect of HeH+ becomes important for higher densities (ρ≤10-6g/cm3), its effect being most important for a temperature around 3500K. Synthetic spectra for a variety of different conditions are presented. Description: The line lists of all the transitions allowed by the dipole transition selection rules are given for 4HeH+, 3HeH+, 4HeD+ and 3HeD+. They includes the vibrational quantum number, the rotational quantum number and the energy of the lower and upper states, the transition frequency and the Einstein A coefficient associated. The line lists were calculated using the program LEVEL 7.5 (Le Roy, 2002, Univ. Waterloo Chemical Physics Research Report CP-655, http://scienide.uwaterloo.ca/~leroy/level/ ). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file 3hed.dat 80 2694 Line list of 3HeD+ (Iso = 23) 3heh.dat 80 1315 Line list of 3HeH+ (Iso = 13) 4hed.dat 80 3133 Line list of 4HeD+ (Iso = 24) 4heh.dat 80 1431 Line list of 4HeH+ (Iso = 14)
Byte-by-byte Description of file: 3hed.dat 3heh.dat 4hed.dat 4heh.dat
Bytes Format Units Label Explanations
1- 13 F13.4 nm Lambda Wavelength of the transition 16- 27 D12.6 s-1 A Einstein A coefficient of the transition 29- 32 F4.1 --- J' Rotational quantum number of the upper state 34- 42 F9.3 cm-1 E' Energy of the upper state 44- 47 F4.1 --- J" Rotational quantum number of the lower state 50- 58 F9.3 cm-1 E" Energy of the lower state 60- 62 I3 --- El [102] Element numbers of the atoms of the molecule in the ascending order 63 A1 --- --- [X] Electronic state of the upper state 64- 65 I2 --- V' Vibrational quantum number of the upper state 71 A1 --- --- [X] Electronic state of the upper state 72- 73 I2 --- V" Vibrational quantum number of the lower state 79- 80 I2 --- Iso Numbers of masses of the atoms of the molecule in the ascending order (23, 13, 24 or 14)
Acknowledgements: Elodie Engel, Gregory Harris, greg(at)theory.phys.ucl.ac.uk
(End) Patricia Vannier [CDS] 22-Feb-2005
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