Which of the following statements would be true for the Hertzsprung-Russell diagram to be expected for an isolated cluster of stars approximately 1 billion years in age?

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    It would be distinctly depleted of O- and B-type stars from the main sequence, with all other stars occupying the main sequence except for a very few white dwarfs.
     It would be heavily depleted in stars above 1 or 2 solar masses from the main sequence, with distinct subgiant, red giant, and horizontal branch populations in evidence and a significant number of white dwarfs.
     It would show most stars to be on the zero-age main sequence, but some small stars are not yet on it ,and a few O-type stars have evolved off of it.
     It would show a distinct turnoff from the main sequence of high-mass stars, with essentially all other stars on or near the zero-age main sequence.
     It would show essentially all stars above one solar mass to be on the zero-age main sequence, but smaller stars would not yet have evolved onto it.
asked Sep 20, 2012 in Astronomy by anonymous
    

1 Answer

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It would be distinctly depleted of O- and B-type stars from the main sequence, with all other stars occupying the main sequence except for a very few white dwarfs.
answered Sep 22, 2012 by SkyStar ~Expert~ (2,855 points)



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