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I was wondering if it would be possible to record the emission/absorption spectra of stars without expensive spectroscopy equipment. Would it be possible to somehow utilize diffraction grating? I own a Newtonian with a 130mm aperture if that helps.

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Here is a link to a diffraction grating that can do what you want. It is mounted in a 1.25" filter ring that attaches to an eyepiece, or to most astro cameras. I believe they also sell adapters for other cameras and software to extract spectra from the photos.

Here is a link to a spectra of Vega that I took with a 120 mm refractor using the Star Analyser grating.

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  • $\begingroup$ Cool! The OP should keep in mind that the spectral range may be limited by the glass and the IR filter in his camera. $\endgroup$
    – Carl Witthoft
    Jun 11, 2019 at 18:00

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