PHYS1902_Quiz7

PHYS1902_Quiz7 - Quiz 7 What is the meaning of zero-age...

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Sheet1 Page 1 Quiz 7 What is the meaning of zero-age main sequence? It is the band on the H-R diagram in which stars are arranged as they begin their extended period of stable nuclear fusion. Correct. The main sequence is the band on the H-R diagram in which most stars are found. "Zero age" refers to the fact that s Why do star clusters provide excellent tests for theories of stellar evolution? The stars in any particular cluster formed at roughly the same time from the same primary material and under the same enviro n Correct. The resulting H-R diagram can be compared with computer models of the evolution of stars without the complications What process characterizes the T Tauri phase of protostellar evolution? Violent surface activity resulting in strong protostellar winds Correct. The T Tauri phase expels residual gas and dust from the region closest to the young protostar, probably affecting the Which of the following statements best describes open clusters? They typically contain a few hundred stars and are a few parsecs across.
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PHYS1902_Quiz7 - Quiz 7 What is the meaning of zero-age...

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