HANDY - (Special) Points in normalization process
Table of Contents
What are Special Points?
Special Points are points manually defined by the user, which will be use to fit continuum line. Each point is defined by its wavelength and ratio its y-coordinate divided by median of little range of flux. Use of ratio insted of y-coordinate make Points portable between defferent spectra we need to normalize. They are needed in places where true continuum is not available in star’s spectrum (eg. near Balmer jump). They need to be used with caution because it easy to bias the spectrum by manually adjusting it to expected result. You should not use them when that is not necessary.
The use of Special Points
- Button Add special point - when this button is active the next left mouse click on the top plot will add special Point
- Auto fit special points - (Be careful with that option!) when you click this button and theoretical spectrum is available then all special Points will be adjusted to fit normed spectrum to theoretical one in narrow surronding of special Points
Saving of Special Points
Special points are included in so called continuum file which can be saved by menu option Save->Save continuum file. Those files contain also all ranges/regions definitions (see more: Regions and ranges).
Example
