Exam 11: Formation and Structure of Stars

What istheresistanceofagastotheflowofradiation?

List three processes energy can be transported between regions.

The temperature at the core of a star must be at least 1 million degrees Kelvin before fusion can begin.

Main sequence O stars have convective cores because they fuse hydrogen in the proton-proton chain.

Stars with masses equal to or less than 1.1 solar masses use the _____________ to convert H into He for their energy source.

The Sun, a one solar mass star, will take approximately how many years to go from protostar to main sequence star?

One trigger that could start the gravitational contraction of a molecular cloud to form stars is a passing shock wave.

The nuclear reactions in a star's core burn steadily so long as the relationship between _____________ and_____________ is stable.

When a large gas cloud starts to collapse in a free-fall due to gravity, the cloud will ____.

When a large gas cloud starts to collapse in a free-fall due to gravity, it will start to cool down as it contracts because of the atoms fall inward.

How do low mass stars in the lower region of the main sequence produce their energy?

Whatis a protostar and how does it get its energy?

How does a gas cloud become hot enough to ignite nuclear reactions?

Star clusters are important to the study the stellar evolution because stars in a given cluster have the same _____________.

After a protostar has progressed in its development, it will have a dense inner part and an outer envelope called a(n) ____.

Which trigger could start the gravitational contraction of a molecular cloud?

As the protostar contracts gravitationally, it will rotate faster and faster and produce a(n) ____.

What is the difference between the proton-proton chain and the CNO cycle?

Convection is important in stars because it transports energy outward in the star.