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Vega Spectrum Angstroms Calibration With Zero Order by RSpec
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The above image is the star Vega (Wikipedia). The round spectral order zero is on the left side of the image and its first order blazed grating spectrum is on the right side.
This web page shows how Field Tested Software RSpec V1.3.0 (Build: 39) non-linear Calibration Wizard was used to calibrate the horziontal axis in angstroms (Å) and shows the results of including the zero order using the four different curves (1st, 2nd, 3rd and 4th).
Below each spectrum is the Calibration Wizard window with the six residuals that are in angstroms and the RMS for that order. Residuals equal to zero are ideal and RMS equals to zero is ideal.
Below is a summary table of the residuals and RMS value calculated in Excel VegaA06-012s06cropRMS.xlsx for both with and without the zero order. This web page shows the details of the calibration with the 0 order. This is the table on the left. Click on the table on the right to see the details of the calibration with the 0 order.
To put the values of the residuals in perspective the difference between CCD camera pixels at Hα is approximately 17.9 Å when using fourth order calibration without the zero order.
RSpec Non-Linear 1st Order Calibration
RSpec Non-Linear 2nd Order Calibration
RSpec Non-Linear 3rd Order Calibration
RSpec Non-Linear 4th Order Calibration
The following test pattern is to help you adjust your monitor to best view the CCD astro images. The test pattern is used for adjusting monitor brightness, and contrast. Adjust monitor brightness and contrast to see all 16 gray scale levels. The most important adjustment when viewing astro images is to see the differences in all of the black bands.