Computer Science
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2350...88a&link_type=abstract
In NASA. Ames Research Center Proc. of the Workshop on Improvements to Photometry p 88-107 (SEE N85-17892 08-89)
Computer Science
2
Air Masses, Amplitudes, Annual Variations, Errors, Interstellar Extinction, Photometry, Stars, Water Vapor, Data Reduction, Optical Properties, Precision, Time Dependence
Scientific paper
Atmospheric extinction, which is one of the main causes of errors in photometry is investigated. The incorrect determination of the extinction coefficient, and its variability, leads to an erroneous measurement. An erroneous extinction coefficient can arise from a number of causes including: (1) instrumental instabilities; (2) too few data points; (3) temporal changes in the atmosphere; and (4) differing airmasses due to components with different scale heights. While it is true that differential measuring techniques can achieve a precision approaching 0.1 percent, at higher levels of precision all of the above causes will be significant sources of error. The conditions that must be met in order to properly determine and correct for atmospheric extinction are discussed.
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