Classes of Stars
Stars are classed according to their
spectra. The photosphere of a star emits
photons at all wavelengths, but the emission at some wavelengths is stronger than at others
depending on the composition of the hot glowing gasses in the star.
We can see examples
of that here on Earth. The tubes of excited neon gas in a neon sign emit pure red light,
while the hot sodium gas in a sodium lamp emits yellow light. In a star, the photosphere is
composed of a variety of chemical elements, so the spectrograph of a star (see image
above) can be quite complex. MORE!
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