This is a re-analysis using RSPEC software of the Vega spectrum I took 4/8/2018 using my Sky Watcher Equinox 80mm Pro telescope & CCDSPEC spectroscope, hand guided on Manfrotto mount.
I have now taken out a trial subscription to RSPEC amateur astronomy spectroscopy software https://www.rspec-astro.com/
The following is the original spectrum taken using Nebulosity 6 software:
This is an x-projection of the above from PCSpectra software supplied with the CCDSPEC spectrometer:
The following screenshot shows the above spectrum loaded and displayed in RSPEC software (below):
In the above diagram, I calibrated the x-axis using a Vega spectrum from the internet, using two points. I have created the following Vega spectrum for calibration purposes based on this internet data. Note that I have annotated the lines using Angstroms as RSPEC uses Angstroms on its x-axis and it all gets rather confusing if one graph is in Angstroms and the other in nanometres as it is not obvious that the difference in scale exists on the x-axis and the graphs do not line up.
RSPEC allows reference spectra to be compared to user spectra. Here, I have loaded up a reference spectrum in blue at the same time as my own Vega spectrum in red (below):
Having calibrated my spectrum against two lines on the reference spectrum I created above from other internet resources, there is excellent correlation between the lines on my spectrum and the RSPEC reference spectrum (no – I did not use the RSPEC spectrum to create my calibration Vega spectrum!)
Another interesting feature in RSPEC is to use it to identify elemental lines – using this feature on my spectrum:
I think that the closest elemental match to the lines seen in my graph is found when both Star Type A is ticked (Vega is A0V) and also Hydrogen Balmer series: