Although they are aestetically unpleasing, these
features do provide a convenient set of reference lines.
We amateur spectroscopists live on the floor of a deep ocean of air consisting mostly of nitrogen, oxygen, water vapor. This water vapor hampers the region around Hα with impressive absorption lines.
We use the telluric lines to improve the wavelength calibration of our spectrum. The shift is typically less than 0.02 Å.
With the help of our synthetic telluric spectrum we can try to weaken the contamination of the stellar spectrum. First adjust the line width and the amplitude of the tellurics and then divide the stellar spectrum by the modified telluric. In theory the telluric lines should vanish from the stellar spectrum. But sometimes we have to apply a little shift and even a very moderate stretch to the tellurics. Nevertheless some artifacts will remain.
I use synthetic spectra computed by TelFit.
Last modified: 2023 Apr 01
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