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Spectral Analysis
What would be required to do spectral analysis of stars, nebulae and
galaxies with an 8 inch SCT? What other equipment would be needed? Anyone have links or other references? Thanks |
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Spectral Analysis
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Spectral Analysis
"Nasty Gash" wrote in message om... (Nasty Gash) wrote in message . com... What would be required to do spectral analysis of stars, nebulae and galaxies with an 8 inch SCT? What other equipment would be needed? Anyone have links or other references? Thanks I should be a bit more specific... I'm interested in studying the spectra (IR to UV or wherever a CCD or vidicon is sensitive) of astronomical objects. What would I need to build an inexpensive spectroscope that I could attach to my 8" SCT? Would this scope even collect enough photons to render a usable image? Is the resolution of a digital camera's CCD fine enough to discern enough emission and absorption lines to make it worthwile? Any comments will be appreciated. There are a couple of units on the market (for instance SBIG, sell their SGS system). A review of this is in the May 2000 S&T. This is about $5000 (not 'inexpensive'...). However there are a number of ways of making a spectroscope. There are designs based on slit interference, ones based on reflective interference (using a CD), and ones based on prisms. One design is at: http://home.freeuk.net/m.gavin/mk1afocal.htm Yes, a typical CCD, is 'fine enough'. You might consider the book: http://www.astunit.com/publications/4894.htm The basic 'optics' (diffraction grating, or prism, and a collimating lens), for a simple spectroscope, can be obtained from most optical suppliers, and will not be too expensive. You'lll probably find that the spectrum is limited by the glass in the optics of both the SCT, the specrometer itself, and the sensitivity of the sensor. However operation across the entire visible spectrum, and a short way beyond is quite possible. Best Wishes |
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Spectral Analysis
Take a look at
http://www.astrosurf.com/audine/Engl...lt/spectro.htm for tha Audine version of spectroscopy Terry B Moree Australia "Nasty Gash" wrote in message om... What would be required to do spectral analysis of stars, nebulae and galaxies with an 8 inch SCT? What other equipment would be needed? Anyone have links or other references? Thanks |
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