Introduction to spectroscopy

[Robin Leadbeater]

Hi David,

I’ve just spotted your latest results on your personal page. These are really nice,  The H alpha emission line in Gamma Cas  shows up very well

Cheers

Robin

[David Swan]

Thanks Robin. I think next on the shopping list is one of these Bahtinov masks – focusing is clearly one of the most tricky parts for a novice like me.

[Dr Andrew Smith]

It is the spectrum you need to focus not the Star. So if you use the mask on the Star you will need to offset for the spectrum.

Regards Andrew 

[David Swan]

Yes, I think Hugh ‘saves’ the Bahtinov mask diffraction pattern after achieving a sharp spectrum on an A type star, and then targets that pattern on the next target star. Sorry, because I am new to it I am not including the pertinent info! David

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