Which Roman numeral luminosity class specifically identifies Bright Giant stars?
Answer
II or III
Bright giant stars are formally classified by their luminosity class, which signifies their evolved status above the main sequence but below the most extreme supergiants. This placement corresponds specifically to luminosity class II or luminosity class III. Class I is reserved for the much more luminous supergiants, while class V denotes main-sequence stars, such as the Sun, which are still undergoing core hydrogen fusion. The designation Class II or III signals that the star has evolved significantly, burning fuel differently than its main-sequence predecessor, resulting in a much higher energy output for its given temperature compared to a Class V star.
Related Questions
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