How Did Astronomers Discover the Relationship Between Spectral Type and Mass

question 35

Multiple Choice

How did astronomers discover the relationship between spectral type and mass for main sequence stars?

• A) by measuring stellar radii with very powerful optical telescopes
• B) by measuring stellar radii with very powerful radio telescopes
• C) by comparing stars with the same spectral type but different luminosities
• D) by using computer models of hydrogen fusion and stellar structure
• E) by measuring the masses and spectral types of main-sequence stars in binary systems

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