What temperature range defines the O spectral type for stars?
Answer
Exceeding 30,000 Kelvin
O-type stars represent the hottest category in the Harvard spectral classification system. They possess surface temperatures exceeding 30,000 Kelvin and appear blue. This high temperature aligns with the principle that hotter objects emit light at shorter, higher-energy wavelengths.

#Videos
STAR COLORS EXPLAINED - YouTube
Related Questions
What physical property primarily determines the color of a star?Which Harvard spectral classification letter represents the Sun?Why do human eyes typically perceive distant stars as white?What does a high positive number in the B-V color index signify?In which constellation can the star system Albireo be found?What temperature range defines the O spectral type for stars?How does defocusing a telescope image assist in observing stellar color?Why are green stars not commonly observed in the night sky?Why is the planet Mars easier to identify by color than distant stars?What is the progression of colors as an object is heated according to blackbody radiation?