Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984msngr..37...24d&link_type=abstract
ESO Messenger (ISSN 0722-0091), Sept. 1984, p. 24-26.
Astronomy and Astrophysics
Astronomy
3
Astronomical Spectroscopy, Calibrating, Charge Coupled Devices, Spectrographs, Stellar Spectrophotometry, Wavelengths, Accuracy, Radial Velocity, Reference Stars, Spectrum Analysis
Scientific paper
Results of an analysis of the spectral data reduced by the CASPEC instrument are reported. In the wavelength calibration performed by CASPEC calibration lines are identified according to a detection criterion which is based on line-width and the intensity above the background. In the commissioning phase nine spectra of 4 velocity standard stars are reduced using the standard procedure in the Munich Image Data Analysis System (MIDAS) of the ESO. The procedures followed by CASPEC for reducing a flat-field CCD image is described. As an example, two extracted orders from a 25 min. exposure of the 12.1 visual magnitude star LTT 3864 are presented.
Dodorico Sandro
Ponz Daniel
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