Physics – Optics
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasp..104..121m&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 104, Feb. 1992, p. 121-126.
Physics
Optics
16
Cassegrain Optics, Charge Coupled Devices, Cross Correlation, Echelle Gratings, Spectrographs, Antenna Feeds, Astronomical Spectroscopy
Scientific paper
The flexure patterns of two classical Cassegrain-fed spectrographs are derived by cross-correlating CCD spectra. After a detailed description of the method used to derive the flexure models, emphasis is given to the fact that extreme care must be used in compensating for those flexures when high precision is sought in wavelength-calibration and radial-velocity work involving instrumentation similar to that investigated here. If not fully accounted for, the flexures can introduce spurious shifts up to one hundred times the typical error of the cross-correlation technique usually used to compare the spectra. With the aid of the present models, it is now possible to remove most of the flexure biases from spectra taken with both spectrographs of the Asiago Astrophysical Observatory over a large fraction of the sky accessible to the telescope derived with the cross-correlation technique. A brief discussion on possible ways to monitor in real time the flexure pattern of a telescope + spectrograph combination is given.
Lattanzi Mario G.
Munari Ulisse
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