Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pasp..102.1200g&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 102, Oct. 1990, p. 1200-1207. Research supported by NSE
Astronomy and Astrophysics
Astronomy
13
Astronomical Spectroscopy, Line Shape, Stellar Spectra, Signal To Noise Ratios, Spectral Bands, Spectrum Analysis
Scientific paper
Seven techniques for fitting comparison-line profiles were selected for tests of their relative and absolute accuracies. Relative accuracies were assessed using high-SNR 2.4-A/mm Reticon spectra by comparing the rms scatter in the observed vs calculated wavelengths for 31 lines. For the seven techniques, the rms values ranged from 1.2 mA to 4.9 mA. Absolute accuracies were determined by measuring artificial spectra composed of Gaussian and instrumental profiles with and without noise added. Both folded and unfolded instrumental profiles were tested. For the folded profiles, the mean shifts were not significantly different from zero. For the unfolded profiles, the mean shifts determined varied from near zero to as high as 0.6 micron. For each technique, individual comparison lines exhibit internally consistent systematic residuals from a polynomial fit to the wavelength calibration.
Gulliver Austin F.
Hill Graham
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