This chapter contains an account of the processes applied to the raw scans, after the observations were completed, to transform them into a set of corrected spectra, suitable for the extraction of parameters to compare with theory, together with some preliminary observations on the data. I describe here the absolute calibration of intensity, and the manner in which the scale and datum position for wavelengths were determined, and how the scans were corrected for various imperfections, interferences and systematic errors. The unexpected discovery of Magnesium I emission is discussed, along with its effect on the interpretation of the data for radial velocity determinations. A system of averaging the fully corrected absorption line scans, grouped according to position in the ecliptic, is described, together with various attempts to fit curves to the experimental points. The method of extracting parameters from the finally chosen Gaussian fits is detailed.


Gaussian Curve Dust Cloud Continuum Level Entrance Aperture Corrected Spectrum 
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Copyright information

© Brian May 2007

Authors and Affiliations

  • Brian Harold May
    • 1
  1. 1.Astrophysics Group Department of PhysicsImperial CollegeLondonUK

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