Extracting a Spectrum from an Image

Raw spectrum images must be dark-subtracted and, with objective-prism and grating-prism spectrographs, flat-fielded before further processing. For the best signal-to-noise ratio, the master dark frame should be averaged or medianed from multiple darks. To further increase the signal-to-noise ratio, multiple spectrum images can be stacked, providing that the spectrum falls in exactly the same location in every image.

With slit- and fiber-fed spectrographs, you should obtain wavelength and flux calibration spectra. Wavelength calibrations are often done using neon and ar-

Ml

Was this article helpful?

0 0
Telescopes Mastery

Telescopes Mastery

Through this ebook, you are going to learn what you will need to know all about the telescopes that can provide a fun and rewarding hobby for you and your family!

Get My Free Ebook


Post a comment