Astroart Forum

Yes,
The Spectra-L200 has an Edmund achromatic doublet....same focusing issues, but I have the imaging camera mounted on a Borg #7315 helical focuser which can give me repeatability within 10 micron.
I use the Filly argon for calibration outside the Ha neon region.

Yes Ken, the choice of the grating is a great dilemma! I don't know if you have (like me) a different focus at UV/center/IR spectral intervals (due to internal doublet). In case, with low-res spectra it would be impossible to have everything correctly focused. On the other hand the use of 1800 l/mm ...

Paolo,
Thanks for that!
Good comparison.
I have the choice of dropping back to the 600 l/mm (which is standard in the Spectra-L200) or push up to the 1800 l/mm
Hmmm decisions, decisions, decisions.....

Very good result Ken! Spectra L-200 works fine with more grooves per mm grating. Profile seems to have a good SNR (I don't see a lot of noise in this spectral interval). Follows a comparison with an early stage Nova Del 2013 spectrum I took on 21 august 2013. There is similarity in h-beta and iron e...

Hmmm Now working at R=4040.... Could have done with more exposure time.... The Hb region is the first processed...showing the now "standard P-Cyg" in both the Hb and Fe lines. I've run a velocity graph based on the Hb (4861A) showing the larger absorption is still around the 1700Km/s All spectra acq...

Well done Ken! It is very good to talk about spectroscopy also here! V1369 Cen is a great target like V339 Del has been for many observers around the world. I think your medium resolution spectra are very useful to astronomical community. Although it is the same type of nova (Fe II nova) it seems to...

Before the clouds moved in, I managed to get a spectrum of the Hb Region. You can see how the profiles are changing and showing some secondary absorption features.... This is proving to be a very interesting nova!! Image acquired and pre-processed in AA5 (Thanks Fabio!) and spectral profile from BAS...

Here's some recent medium res spectra of Nova Cen. Spectra-L200 spectroscope with 300 l/mm grating. Imaged using AA5 and ATiK314L. The emission lines of Fe continue to be obvious and some structure coming out in the line profiles. Enjoy! NovaCen_Ha_241213.bass.png NovaCen_Ha_enlarged241213.bass.png ...

Martino, Thanks for the comments. Appreciated. I accept that spectroscopy isn't for everybody, but seriously if you have the equipment (Scope/ camera/ mount) you could be making some very worthwhile contributions to the science of astronomy. There are many freeware (and commercial) packages for the ...

Excellent work Merlin66!
Thank you for sharing. Please keep us update with your progress and needs in amateur spectroscopy.

Regards
Martino Nicolini

I thought you might like to see what sort of spectral results you can get from a simple grating and a Genesis (4" f5) scope. NovaCen2013.bass.png The imaging camera was an ATiK16icS controlled by AA5. The darks and subs were (eventually! - See my other thread on stacking spectra) pre-processed by AA...

Thank you Ken, effectively worldwide we use almost the same tools! This experience was made with a high resolution spectrograph but I think is very important to know that a plenty of interesting observations (and related studies) can be also performed with a simple grating like the Star Analyser 100...