Listed Below Are Parameters of Stars That Astronomers Obtained from Their

question 42

Multiple Choice

Listed below are parameters of stars that astronomers obtained from their measurements. Which of these conclusions is obviously NOT possible, based on the positions of these stars on the Hertzsprung-Russell diagram in Figure 12-8 in the text? (L_s and R_s are the luminosity and radius of the Sun, respectively.)

• A) luminosity = L_s, radius = R_s, temperature = 6000 K; conclusion: main-sequence star
• B) luminosity = 10⁴ L_s, radius = 100 R_s, temperature = 5000 K; conclusion: red giant star
• C) luminosity = L_s, radius = 1/10 R_s, temperature = 20,000 K; conclusion: white dwarf star
• D) luminosity = 1/100 L_s, radius = 1/100 R_s, temperature = 20,000 K; conclusion: white dwarf star