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Hi Peter, I don't have much experience with UVEX, which I've only used a few times on my RC12, especially in the UV section, A few things to check: - With regard to the telescope, it seems to me that a CDK has lenses and that this can therefore affect transmission in the near-UV range below 400nm (t...

Hola Joan, I think the page you are referring to on LISA in polarimetric spectro is this one: http://www.astrosurf.com/buil/polar4/ Of course, the Zeeman effect isn't measured in this case, so it's accessible at low resolution, but on luminous targets because the variations to be measured are of the...

Hello Joan I don't know which of Christian's pages you're referring to, but to do spectropolarimetry you need to use a high-resolution spectrograph (> R=20000) to see the Zeeman effect, for example. And you need to be able to turn the 1/4-wave plate during acquisition to obtain various polarization ...

Great spectrum Tom !!!!
and a challenge to make its spectrum when it's very low on the horizon.

we'd love to have the same astro show on French TV channels....

In any case, it was a very good collaboration between amateurs and professionals, and the responsiveness of the amateurs showed that it was important.

Difficile de savoir ou se situe le problème... Déjà il faudrait faire un spectre de la lumière du jour et le traiter (donc sans autoguidage et de jour). Vu le temps de pose très faible sur la lumière du jour, on verra déjà si le spectre a une bonne allure ou pas. Quel caméra est utilisé pour produir...

Bonjour Nicolas, Pour la première question difficile de répondre sans avoir plus d'éléments, mais ce que je peut dire c'est que le spectro ne semble pas bien focalisé au départ, certes celà n'a rien a voir avec l'autoguidage, mais déjà les raies ne sont pas fines du tout. Voici un spectre de Vega ré...

Le stage spectro OHP 2024 est complet, les pré-inscriptions sont terminées.

Hello Tom,

a very good follow-up to this Sn!!!
We don't have very good weather in Chile right now (the 45-day bad weather period is underway..).

A voir sur la chaine Youtube : La Chaine Astro, ma présentation spectro durant les RCE 2022 :
https://www.youtube.com/watch?v=E5vERmuFLYU