What wavelength spacing should be used in computing a synthetic spectrum?
For detailed comparison with a high-resolution spectrum, it is advisable
to compute the synthetic spectrum with a very fine spacing, 0.01 or even
0.005Å. For synthetic spectra which will be smoothed to match medium or
classification-resolution spectra (
Å resolution), a spacing
of 0.02Å is adequate. Finally, for computing flux spectra over a
broad wavelength range, to be smoothed to a low resolution, a spacing
of 0.05Å may be used without noticeable degradation in the final
smoothed spectrum.
The linelist file luke.lst is adequate for computing spectra which will be smoothed to medium or low resolutions. However, for more detailed work, it is necessary to take into account isotope shifts and hyperfine structure. The linelist file luke.iso.lst, available on the distribution website, is thus recommended as a starting point for detailed work.