A digital image processing method for automatic reduction of echelle spectrograms

Details A digital image processing method for automatic reduction of echelle spectrograms A digital image processing method for automatic reduction of echelle spectrograms

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...111..260m&link_type=abstract

Astronomy and Astrophysics, vol. 111, no. 2, July 1982, p. 260-265. Research supported by the Comision Nacional de Investigacio

Astronomy and Astrophysics

Astrophysics

4

Astronomical Spectroscopy, Data Reduction, Digital Techniques, Image Processing, Stellar Spectra, Computer Programs, Image Enhancement, Spectrograms

Scientific paper

Software for correcting and processing echelle spectrograms is developed. Without knowing them a priori, the geometric deformations of these spectrograms are obtained. The algorithms can be implemented in a minicomputer with a capability of 128 Kbytes. The time for reducing one spectrum is less than 6 min. The accuracy of the method in wavelength calibration is approximately 0.01 A, which corresponds to an inaccuracy of 0.65 km/s in radial velocity (at 4600 A). It is noted that this is smaller than that given by other methods. The method described here does not require a microdensitometer programmed for curve following.

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