Physics – Optics
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasp..106.1184g&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 106, no. 705, p. 1184-1189
Physics
Optics
2
Astronomical Spectroscopy, Causes, Contamination, Optical Measurement, Ultraviolet Radiation, Ultraviolet Spectra, Cassegrain Optics, Diffraction, Geometrical Optics, Line Spectra, Numerical Analysis, Planetary Nebulae, Schmidt Cameras
Scientific paper
Observations of the planetary nebula Me 2-1 are used to discuss some effects of contamination produced by the second-order ultraviolet spectrum in the first-order red, longer than approximately 6200 A. It is found that this contamination is present with some instrumental setups, and that the contaminating lines are displaced in wavelength with respect to the predictions from diffraction theory by an amount which varies slightly for different setups. From the theoretical and empirical analysis of these displacements, it is concluded that the shift in wavelength is due to the presence of chromatic difference in magnification in spectrograph cameras including any transmission element, as in the case in the semi-solid Schmidt-Cassegrain cameras used in our observations.
Gutierrez-Moreno Adelina
Hamuy Mario
Heathcote Stephen
Moreno Heidi
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