Re: A one hour construction spectrograph and spectra
Posted: Sun Sep 21, 2014 1:30 pm
Hi Robin,
The magnitude of the objects is crucial. You and me have a very polluted sky, this is not the case all amateurs, hopefully!
I believe that with a 50 micron fiber, and with my sky, I can capture without much problem spectra for star up to magnitude 11 by using a generic atmospheric spectrum, and producing an error not too significant .
For most faintest stars, dual fiber fed becomes helpful, it's clear. This is probably the case for magnitude range magnitude 11 to 14. It is a long work to realize such system, but it will be accessible for amateurs one days, I am sure...
For spectroscopy of ultra-faint objects (V = 14, 15, 16, 17, ...), low resolution spectrograph placed directly on the telescope is probably preferable because the setup is compact and lightweight (like SA, Alpy 600 ...).
Christian
The magnitude of the objects is crucial. You and me have a very polluted sky, this is not the case all amateurs, hopefully!
I believe that with a 50 micron fiber, and with my sky, I can capture without much problem spectra for star up to magnitude 11 by using a generic atmospheric spectrum, and producing an error not too significant .
For most faintest stars, dual fiber fed becomes helpful, it's clear. This is probably the case for magnitude range magnitude 11 to 14. It is a long work to realize such system, but it will be accessible for amateurs one days, I am sure...
For spectroscopy of ultra-faint objects (V = 14, 15, 16, 17, ...), low resolution spectrograph placed directly on the telescope is probably preferable because the setup is compact and lightweight (like SA, Alpy 600 ...).
Christian