Lifetime of Stars

1)If the main sequence lifetime of a one solar mass star is 10 billion years show, using the above scaling and that L α M⁴, that the main sequence lifetime of a 4 solar mass star would be about a few hundred million years.

2) What is the lifetime of a 0.1 Solar mass star?

3) How about the lifetime of a 2.0 solar mass star?

Discussion

1. Be able to calculate the lifetime of a star based on its mass using the above relationship.

2. What is the difference between age and lifetime of a star?

3. From Lecture 3F: What are two characteristics of all main sequence stars?

4. From Lecture 3F: Explain why there are fewer main sequence stars more massive that the sun on the HR diagram of all stars within 15pc of the sun (see below)?