Physics – Optics
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasp..104...71y&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 104, Jan. 1992, p. 71-75.
Physics
Optics
1
Digital Techniques, Error Analysis, Point Spread Functions, Scaling, Stellar Spectra, Astronomical Photography, Charge Coupled Devices, Signal To Noise Ratios
Scientific paper
The analysis is discussed of some peculiarities found in semiraw spectroscopic CCD data, and it is shown that they result from effects that correlate with the zenith angle at the time of observation. The ultimate cause of such effects appear to be alterations of the point-spread function of the stellar image that is delivered to the entrance aperture of the spectrograph by the combination of the telescope optics and the terrestrial atmosphere along different sight paths. Based upon this working hypothesis, a strategy is developed for coping with the problem which leads to a scale-normalization procedure akin to fitting a (pseudo) continuum to stellar spectra. An objective method is given for detecting systematic effects and eliminating them, so as to achieve the optimum detection capability that the signal-to-noise ratio of the data will permit.
Rottler Lee
Young Arthur
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