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extreme horizontal branch star (EHB star)
The hottest variety of stars on the horizontal branch of the Hertzsprung-Russell diagram, with temperatures of about 25,000 K; also known as extended horizontal branch stars. EHB stars are believed to account for the faint ultraviolet glow shown by many elliptical galaxies, which otherwise consist of old, cool stars. Subdwarf B (sdB) stars are low-mass evolved extreme horizontal branch stars in which core helium-burning has just started.
Related categories
• TYPES OF STAR
• STELLAR ASTROPHYSICS
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