*help*... (1 Viewer)

[*yooneek*]

does anyone know how to answer this question…

”Explain how the age of a globular cluster can be determined from its zero-age main sequence plot for a H-R diagram.”
and…
”Identify one piece of technology that has been used to help make this determination”

I’ve found out the answer for open clusters, but I can’t find out how the age of a globular cluster can be found using ZAMS…
any links to sites or whatever would be so appreciated
thanks x

 

[Bookie]

Old globular clusters will have not so many stars on the main sequence line, cos stars have evolved and are like different types of stars, like Pop I stars as oppose dto normal Pop II stars.
Newer clusters will have most stars on the main sequence line.

I dont know anymore

I dont do astrophysics.

 

[*yooneek*]

i detect ultra~smartness :uhhuh:
you know heaps for not doing it!
thanks arghya!

i found an old thread and its given me a good staring point

 

[helper]

A cluster is a group of stars of the same age. When you plot them on the H-R diagram, you are plotting a group of same age stars.

Stars on the top left of the Main Sequence are larger and have shorte lifes, so they use up their H first and leave the main sequence first and head towards the Red Giant Phase.

So looking at the plot of the cluster, there will be a branch off the main sequence to the right. The lower down this branch is, the older the cluster. This is because all the stars above have used up their H.