How to Capture Exciting Star Spectra with a Small Telescope - AstroFest 2020 - Tom Field

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Tom Field - President, Field Tested Systems and Contributing Editor, Sky & Telescope Magazine will discuss how even with a modest telescope, you can capture spectra from stars to learn about what they are made of.
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[@tedhuntington7692]

great video- one interesting thing that many people do not realize is that the so-0called Bragg equation (the grating equation), reveals, through simple trigonometry that light source distance greatly affects spectral line position- so for example, the more distant a light source, the larger the spectrum, so in the photo with spectra of the stars around 16:53, you can see the dimmer star in the middle must be farther away because the spectrum is smaller than the brighter star near the top- sounds crazy but it is simple trigonometry based on the distance of the light source which changes the angle for any particular color of light.

[@tedhuntington7692]

you can easily observe this phenomenon by looking at two different distant lamps with a plastic grating sheet - or two aligned street lights that are at different distances.

[@abhishekrajak2155]

Star analyser is a bit expensive for me, can you please tell its alternative for doing stellar spectroscopy?

[@jeremiahtrumanmusik6186]

Hi, you can use a cd or dvd (taking off any labels with tape) and just place it over the camera at an angle to the light rays. I havent tried with actual stars, but works with light slit in dark room.