# SCI 214 Week 4 iLab HR Diagram Recent

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SCI 214 Week 4 iLab HR Diagram Recent

Lab 4: H-R Diagram – Gain practical understanding of the HR Diagram and investigate different classes of stars and their evolutionary paths.
Instructions: Investigate the simulation with different stars to find out more about their lifetimes and paths. Follow the specific sub activities in the questions below.
PreLab Questions: (2 points each)
Question 1: Why does the night sky have many different brightness stars but when we look at a HR diagram they are plotted with very similar magnitudes
Question 2: Why are there some stars that do not fall on the main sequence?
1.The main sequence lifetimes of stars follow a particular relationship. A consequence of this relationship is that whenever you double the mass of a star, its main sequence lifetime increases by a fixed amount. Let us test this simulation against that relationship.
Set the mass of the star to 1.0 solar masses.
a) What is the total main sequence lifetime of a 1 solar mass star? (Recall that the main sequence lifetime is the age that the star has at the left-most point on its curve on the HR diagram.)
b) What is the total main sequence lifetime of a 2 solar mass star?
c) What is the total main sequence lifetime of a star that is 4 solar masses?
d) What is the ratio of the main sequence lifetime of a 1 solar-mass star to that of a 2 solar-mass star? (Show your work for full credit.)
e) What is the ratio of the main sequence lifetime of a 2 solar-mass star to that of a 4 solar mass star?
f) Did you get the approximately the same number? (What does approximately mean in this context

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