Comparative performances of an objective grating concept in U.V. spectroscopic observations of solar system objects. IV - Molecular absorption structures in planetary atmospheres

Details Comparative performances of an objective grating concept in U.V. spectroscopic observations of solar system objects. IV - Molecular absorption structures in planetary atmospheres Comparative performances of an objective grating concept in U.V. spectroscopic observations of solar system objects. IV - Molecular absorption structures in planetary atmospheres

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988ap%26ss.147..195b&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 147, no. 2, Aug. 1988, p. 195-217.

Astronomy and Astrophysics

Astronomy

Absorption Spectra, Astronomical Spectroscopy, Gratings (Spectra), Molecular Spectra, Planetary Atmospheres, Ultraviolet Spectroscopy, Atmospheric Composition, Planetary Composition, Planetary Evolution, Spaceborne Astronomy

Scientific paper

The authors propose a method of data reduction which consists in focusing the images corresponding to different positions of the absorbing areas on the disk back onto a common frame of reference. The influence of the various parameters defining the absorption structure in the source on the contrast and width of the observed absorption dip is investigated as a function of the spectral dispersion of the instrument, as well as the effect due to spurious assumptions on the longitudinal position of the absorption area. A comparison with the performances of a long slit spectrograph capable of performing similar measurements shows that the objective grating concept, when optimized to the particular absorption bands of interest, has a significant advantage in terms of sensitivity, simultaneous spatial coverage and data reduction flexibility.

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