Terrestrial O2 lines used as wavelength references Experimental profiles and asymmetries vs. model computations

Details Terrestrial O2 lines used as wavelength references Experimental profiles and asymmetries vs. model computations Terrestrial O2 lines used as wavelength references Experimental profiles and asymmetries vs. model computations

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...149..357c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 149, no. 2, Aug. 1985, p. 357-364. Research supported by the Universita di Fir

Astronomy and Astrophysics

Astrophysics

32

Earth Atmosphere, Oxygen Spectra, Spectral Line Width, Telluric Lines, Wavelengths, Asymmetry, Atmospheric Attenuation, Fabry-Perot Spectrometers, Space Observations (From Earth), Spectral Energy Distribution, Standards, Stellar Spectrophotometry, Vibrational Spectra, Wind Effects

Scientific paper

In order to evaluate wind and pressure effects on telluric lines, the profiles and the bisectors of four rotational lines of the gamma band is compared with the results of detailed theoretical calculations. The analysis is carried out using standard models of the terrestrial atmosphere and the molecular data available in the literature. In particular, a height-dependent pressure shift of the line profile has been included in the calculations, leading to a satisfactory agreement with the observations. The computer code for line transfer in the earth's atmosphere correctly reproduces also the profiles and the bisectors of the same lines obtained at the height of the Jungfraujoch, as can be deduced from the Liege Atlas (Delbouille et al., 1973). Finally, the line shifts observed by Balthasar et al. (1982) are compared with line shifts computed with the present code, including wind shifts and pressure shifts. It is found that the amount by which the varying asymmetry of the lines may affect wavelength determinations depends upon the definition of the line wavelength itself.

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