|
Description
The catalogue presents spectra of MWC 342 (V1972 Cyg) obtained during the period 2004 to 2010 with the Coude spectrograph at the 2m telescope in Ondrejov observatory, Czech Republic, using the SITe CCD (2030x800 pixels, 15um pixel size) in a camera with 700mm focus. The spectral interval along the H{alpha} line covers 6265 to 6765{AA}. The resolving power is this range is R~13000. The data reduction was performed using IRAF. After the bias subtraction, flat-field and overscan correction, the dcr program written by Pych (2004PASP..116..148P) was used for the cosmic ray removal. The spectra subtraction was done by IRAF apall task without using the optimal extraction . The background, together with the night sky lines, is eliminated during spectra subtraction by individual pixel columns. The remaining wavelength calibration, heliocentric correction, and the continuum fitting are also performed using IRAF. The heliocentric correction was applied on the data. Chebyshev polynomial of the third order is used for the spectra normalisation to fit the intervals, which apparently contain no spectral lines. Each continuum interval is split into sub-intervals of five pixels, where the median value is taken for the continuum evaluation. Possible remaining cosmic ray hits thus do not affect continuum normalisation.
|
