Vspec+ccd+response+calibration

See Vspec frequency calibration for the previouse procedure.

The following images show how to create a master file for calibrating the spectra for CCD/system response. This master can then be used thoughout the night for objects at similar elevations.

Objects at different elevations should use a new calibrated master.

First tsak is to select Tools/Libary as in the image below.



Then select the reference star spectra that is the same (or as similar as possible) to the image spectra you have loaded. Drag and drop the file onto the graph.



When done, you will see two graphs. One is the source image, the other is the reference star just dragged in from the libary.



Ensure that you have selected 'intesity' on the drop down box. Next you have to dive the curves by clicking Operations/Divide profile by profile. Ensure that 'intensity' profile has been selected in the pull down box before you Divide profile by profile.



A box will appear that will be Division '(image) intensity' By 'What'. Click on the reference star just dragged and dropped in.



When done, you will then have 3 graphs. The newly created curve (green in the image below) is the CCD/system response, but with noise in it. You then have to 'smooth' the curve manually as in the next images.



Ensure that you have selected 'Division' on the drop down box. Then click Radiometry and then Compute Continuum.

Then using the left button on the mouse select the sections of the graph that have large peaks and troughs. Hold the mouse button down and drag the mouse to select.

Right click and 'Elimine' will appear. Press enter to remove the section selected.

When complete, the screen will look similar to below with a number of sections missing.



Then click Radiomerty and Extract. A new curve will appear that is a smoothed line from the division curve. This can be further smoothed as shown below.