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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, ). 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)
(End) Patricia Vannier [CDS] 22-Feb-2005
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

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