-Refer to the H-R diagram.How would the H-R diagram of an older star cluster look different?
A)The points would shift to the right, because all of the stars would have lower temperatures.
B)The lower main sequence would look the same, but the turnoff would be at spectral type K or M.
C)The points would shift down, because all of the stars would have lower luminosities.
D)The lower main sequence would look the same, but the turnoff would be at spectral type F or A.

Question

-Refer to the H-R diagram.How would the H-R diagram of an older star cluster look different?
A)The points would shift to the right, because all of the stars would have lower temperatures. 
B)The lower main sequence would look the same, but the turnoff would be at spectral type K or M. 
C)The points would shift down, because all of the stars would have lower luminosities. 
D)The lower main sequence would look the same, but the turnoff would be at spectral type F or A.

Quizplus · Accepted Answer

In an older star cluster, the turnoff point on the H-R diagram shifts to cooler, less massive stars, such as spectral type K or M, as the more massive stars have already evolved off the main sequence.

-Refer to the H-R Diagram