The Luminosity of a star is the total amount of energy it emits per second.
The radiant power emitted by a light-emitting device over time is measured as luminosity, which is an absolute measure of radiated electromagnetic power. The total quantity of electromagnetic energy emitted per unit of time by a star, galaxy, or other celestial object is referred to as luminosity in astronomy.
Luminosity classes are denoted by Roman numerals ranging from I to V: I denotes supergiant stars, II denotes bright giants, III denotes ordinary giants, IV denotes subgiants, and V is ordinary main sequence stars. The spectral classification of a star is then completed by stating both the spectral class and the luminosity class.
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