One more Astronomy ? ! THANKS FOR YOUR HELP!?

Question

Stars in a star cluster:

a) all have the same age
b)all have the same chemical compoosition
c)all have the sam luminosity
d)all of the above
e)a and b above

Thanks for your help. I have a feeling my teacher has no idea what is going on. I appreciate your feedback :). Unfortunately it will be fed through the scantron machine and will not be given much thought!

Answer 1

a) Is sort of true. Stars in a cluster tend to form within a few million years of each other, because that's a characteristic time for star formation within a molecular cloud. Many millions of years later the star cluster will still exist and so, to a good approximation, the stars will all be about the same age.

b) Is also sort of true. The star-forming material in molecular clouds tends to be fairly well-mixed, and so to the extent that the star formation process does not involve chemical fractionation, the stars will have approximately the same chemical compostion.

c) Is not true. The star forming process tends to form stars over a range of masses, and the mass of any given star tends to be driven by random processes. Since the luminosity is a strong function of mass, the luminosities of the stars will vary.

Answer 2

a million) the celebs' distances are disregarded while relating their places on the Celestial Sphere. 2) The Celestial Sphere is a real looking coordinate gadget for discovering astronomical products for assertion.

Answer 3

Do you know the why? Think of a commonsense reason why A would be true. Also why B could be true (even if it's approximate). What's the reason C wouldn't be true?

Answer 4

THE ANSWER IS F NONE OF THE ABOVE. STARS ARE ''BORN'' OF GAS AND MATTER IN A ''CLOUD'', NOT MADE AT SAME TIME.

Answer 5

e