An instrument that spreads out the light gathered by a telescope so that it can be analyzed to determine many different properties of celestial objects These properties include the chemical composition and abundance of different elements, temperature, radial velocity, rotational velocity, and magnetic fields
An instrument that spreads light or other electromagnetic radiation into it's component wavelengths (spectrum), recording the results photographically or electronically
A device that separates light by wavelength (color) in order to produce a spectrum that allows for the identification of elements within the light source We have a spectrograph attachment for the CCD camera from SBIG