6 9 A student finds a Hertzsprung-Russell diagram in an old astronomy book and notices that the axes aren’t the same as in her current textbook. Absolute magnitude Spectral class –10 –5 0 +5 +10 +15 O B A F G K M Supergiants Giants Main sequence White dwarfs Which of the following graphs shows a correct alternative way to label the axes? Luminosity / Luminosity of Sun Temperature / K 10 000 100 1.0 0.01 3000 Supergiants Giants Main sequence White dwarfs A 5000 10 000 30 000 Luminosity / Luminosity of Sun Temperature / K 10 000 100 1.0 0.01 30 000 Supergiants Giants Main sequence White dwarfs B 10 000 5000 3000 Temperature / K 30 000 10 000 5000 3000 0.01 Supergiants Giants Main sequence White dwarfs C 1.0 100 10 000 30 000 10 000 5000 3000 10 000 Supergiants Giants Main sequence White dwarfs D 100 1.0 0.01 Temperature / K Luminosity / Luminosity of Sun Luminosity / Luminosity of Sun A B C D (Total for Question 9 = 1 mark)