What does the Hertzsprung-Russell Diagram NOT plot?
A. temperature and mass
B. spectral class and absolute magnitude
C. absolute magnitude and luminosity
D. spectral class and temperature
Is it B?
Nope, of course not.
http://astrosun2.astro.cornell.edu/academics/courses/astro201/hr_diagram.htm
So A?
It was A. Thank you!
To determine the correct answer, let's analyze each option:
A. The Hertzsprung-Russell Diagram does plot temperature on the horizontal axis and mass is indirectly represented through the various stages of stellar evolution. Therefore, option A is not the correct answer.
B. The Hertzsprung-Russell Diagram plots spectral class on the horizontal axis and absolute magnitude (brightness) on the vertical axis. Thus, option B is also not the correct answer.
C. The Hertzsprung-Russell Diagram does plot absolute magnitude (brightness) on the vertical axis. Luminosity represents the total amount of energy a star emits and is closely related to the star's absolute magnitude. Therefore, option C is not the correct answer.
D. The Hertzsprung-Russell Diagram indeed plots spectral class on the horizontal axis and temperature is represented by the spectral class itself. Hence, option D is the correct answer.
Therefore, the correct answer is D. The Hertzsprung-Russell Diagram does not plot spectral class and temperature.