Hertzsprung Russell (HR) Diagram Spectral Types: Proxy for T eff Or surface temperature
Hertzsprung Russell (HR) Diagram Spectral Types: Proxy for T eff Or surface temperature. Our Sun: 5,700 deg Kelvin Or about 10,000 F. O B A F G K M L T. Not to scale: Red Giant 100 times bigger than Main Sequence Star. Pre main sequence evolution: Protostellar, self-gravitating
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