As soon as the intensity curve is revealed, some simple spectral lines can be recognized with some experience. This the tricky part of the Spectral processing as there is no automatic tool to immediately detect and tag the lines on every spectrum. The hardest part is when the very first spectrum is displayed as the parameters of spectral sampling are mainly unknown. The first strategy consists into identifying key, well-known lines. Not all the stars exhibit these features, it all depends of the spectral type.
Atmospheric lines can also play an interesting role when looking for characteristic features.
Water vapor has molecular large band lines at precise wavelength which can help to graduate intensity curve into wavelength as they show up in any spectral type, coming from the earth itself. Atmospheric lines can also play an interesting role when looking for characteristic features. Water vapor has molecular large band lines at precise wavelength which can help to graduate intensity curve into wavelength as they show up in any spectral type, coming from the earth itself. Using standard spectrum from library Visual Spec offers you a set of spectrum from almost all the classical spectral type. They are in the Libspec directory in .dat format.