Here's how they are interconnected:
* Spectral type: This classification system is based on the star's absorption lines in its spectrum. These lines are caused by elements in the star's atmosphere absorbing specific wavelengths of light. The pattern of these lines depends on the star's temperature, so spectral types are directly related to temperature.
* Surface temperature: This is a direct measure of how hot the star's outer layers are. The hotter the star, the more energetic its photons are, and the shorter the wavelengths of light it emits.
* Color: The color of a star is determined by the peak wavelength of its emitted light. Hotter stars emit more blue light, while cooler stars emit more red light.
In essence, these are different ways of describing the same underlying phenomenon:
* Hotter stars: emit more blue light, have strong absorption lines from ionized elements, and are classified as O, B, A, or F spectral types.
* Cooler stars: emit more red light, have weaker absorption lines from neutral elements, and are classified as G, K, or M spectral types.
Therefore, knowing one of these characteristics often allows you to deduce the other two. For example, if you know a star is red in color, you can infer that it is relatively cool and has a spectral type of K or M.
