Les spectrographes pour l'astronomie

[Norbert Jorun]

Dans ma quête d'avoir un spectrographe, j'essaie de recenser les divers instruments.
Voici la liste des instruments que j'ai pu trouver sur ce forum ou sur le net :

- Star Analyser : https://www.rspec-astro.com/star-analyser/

- Alpy 600 : https://www.shelyak.com/produit/alpy-600/

- Low Spec : en impression 3D https://www.meccanismocomplesso.org/en/ ... ctroscope/

- UVEX : 2 versions
• commercial : https://www.shelyak.com/produit/es0021-uvex/
• en impression 3D : http://spectro-uvex.tech

- LISA : https://www.shelyak.com/produit/pf0021v ... e-visible/ il existe aussi une version IR

- LHIRES III : https://www.shelyak.com/produit/lhires-iii/

- L200 : https://www.astroshop.de/fr/spectrograp ... 00/p,47320 Semble ne plus être commercialisé mais ressemble beaucoup au LHIRES III

- Starlight Xpress SX : https://www.astroshop.de/fr/spectrograp ... er/p,48690

- SBIG SGS : https://cdn.diffractionlimited.com/down ... h-SGS5.pdf n'est plus fabriqué par SBIG

- Dados : https://www.baader-planetarium.com/en/s ... graph.html

- Sol'Ex/Star'Ex : en impression 3D : http://www.astrosurf.com/solex/

Et les spectrographes echelles :
- Baches : https://www.baader-planetarium.com/en/b ... graph.html

- eShel : https://www.shelyak.com/produit/pf0011- ... ope-eshel/

- Nou-T : pas trouvé de site internet

- Aryelle 150 : http://www.ltb-berlin.de/en/products/sp ... yelle-150/

- Lynx : pas trouvé de site internet

- Whoppshel : https://www.shelyak.com/produit/whoppshel/

- Musicos : https://www.ing.iac.es/Astronomy/instru ... y/musicos/

Est ce que j'ai oublié un spectrographe où avez vous connaissance d'autres modèles ?

[Joan Guarro Flo]

Bonjour Norbert,

I think that first you could tell us what your current equipment is, and your future intentions are. Figuratively it is not the same as a coffee spoon as a table knife, they both tools are useful for one good lunch, but they serve different purposes.

Cordialement, J. Guarro.

[Robin Leadbeater]

The website for the Star Analyser manufacturer is
https://www.patonhawksley.com/astronomy-1
(I am the developer of the Star Analyser. RSpec astro just resell it in the US)

The L200, SBig SGS are no longer available. (There is also the SBig DSS which is also no longer available)

The Aryelle 150 is a lab spectrograph, not for astronomy

I have not heard of the Lynx

The MUSICOS is a spectrograph on a large professional telescope. (Almost every professional telescope has its own unique spectrograph.) If you include this you must include many other similar unique spectrographs (ELODIE, SOPHIE,ARCES,GIRRAFEE, FLAMES etc etc.....) but you cannot buy one

Cheers
Robin

[Norbert Jorun]

@ Joan : I would like to mesure radial velocity from binary stars. But also take spectra from very faint target (of course with not the same resolution)
As it is not possible to have a universal spectrograph, it's therefore necessary to be able to choose the right spectrograph according to the use that we intend to make of it
@ Robin : For MUSICOS, There are several in service including one that I was able to use at the St Veran observatory:
http://www.astrosurf.com/thizy/musicos/musicos.htm
https://astroqueyras.com/sites/default/ ... icos-2.pdf
This spectrograph is on an optical bench and has Canon lens optics. I'm not sure that we can easily find plans to build one by myself...

[Joan Guarro Flo]

Hello Norbert,

Robin has mentioned the LINX spectrograph, how complementary information I want tell you that the LINX and MUSSOL are two echelle spectrographs that I made and I used to for a long time and I would send, you can see is this forum more information here,
http://www.spectro-aras.com/forum/viewt ... =44&t=2633, also I have NOU_T ones.

MUSSOL and LINX work really well they work with optical fiber and an agitator, I could leave you one to try, because I don't use them now due that I observe with the NOU_T it woks without optical fiber.

But what is your current equipment ? Telescope, camera, new options..

Cheers, J. Guarro.

[Joan Guarro Flo]

Norbert,

Sorry, the information is in, http://www.spectro-aras.com/forum/viewt ... =44&t=2633.

Joan.

[Robin Leadbeater]

There is a recent discussion on radial velocity measurement here
http://www.spectro-aras.com/forum/viewt ... f=8&t=2823

Spectrograph stability is important (The LHIRES is not very stable so I had to use special wavelength calibration techniques to get high precision with the LHIRES)

Cheers
Robin

[Norbert Jorun]

@Joan : Thank you, but first, I would like to collect as much information as possible about each spectrograph (Resolution, wavelength domain and range, efficiency, stability, size, weight, compatibility with this or that telescope or refractor, etc..) And then, the choice between a commercial device or a DIY device. and then the total cost (with two camera)

@Robin : Thank you for your answer, yes I know that the LHIRES III is not very stable, but I have seen people take velocity measurements on Jupiter or some varial stars like Mizar, undoubtedly with great precautions at the level of acquisitions and data processing and maybe short time exposure. I saw the link to the subject of radial velocity accurency and that's why I want to collect informations about all spectrographs (not just see graphs or result without an error margin calculation).

[Robin Leadbeater]

efficiency, stability,

Manufacturers should publish these figures for amateur spectrographs but unfortunately they never do. The performance of the optics is also important if you want a wide spectral range. (The LHIRES for example was not designed for low resolution wide range work). You can get an idea from theoretical calculations but the only real way to find out how a spectrograph performs is to talk to owners and look at the results they have published, for example here or in the BAA, ARAS, AAVSO databases. Even then it is difficult to find a direct comparison of performance between some spectrographs. I know no direct comparisons between the performance a DADOS and a LHIRES at the same resolution for example.

Cheers
Robin

[Robin Leadbeater]

I would like to mesure radial velocity from binary stars. But also take spectra from very faint target (of course with not the same resolution)
As it is not possible to have a universal spectrograph, it's therefore necessary to be able to choose the right spectrograph according to the use that we intend to make of it

You have chosen two very different applications. The best spectrograph for one will not the the best for the other, that is why I have more than one spectrograph. Here are some examples on my BAA pages

Very faint objects with a specially modified ALPY
https://britastro.org/observations/obse ... ebf4faaefe
https://britastro.org/observations/obse ... a1616f5396

High precision radial velocity with a LHIRES
https://britastro.org/observations/obse ... 9847234997
https://britastro.org/observations/obse ... 4359198628
https://britastro.org/video/13862/14769
at 18:35

These used special techniques to avoid the problem of LHIRES stability