Exam 13: Stellar Evolution: the Lives and Deaths of Stars

How has the chemical composition of the Sun changed in the last 4.5 billion years? How will this affect its future?

Type II supernova spectra are poor in hydrogen because stars that explode this way use up all their hydrogen before they leave the main sequence.

Very little hydrogen is found in the spectrum of a(n) supernova.

While there are none yet, in the very distant future, most normal matter will be in the form of black dwarfs.

A recurring nova might eventually build up enough mass to become a Type _ supernova.

Which of the following best describes the evolutionary track of the most massive stars?

The helium flash shows up on the H- R diagram on the way to the horizontal branch.

A white dwarf's atoms have their electron orbitals crushed as closely as the Exclusion Principle allows.

In a very young star cluster, while the most massive stars are swelling up into giants, the least massive stars are

Which of these events is NOT possible?

A 100 million- year- old open cluster will no longer contain any O- type stars.

Our Sun should become a planetary nebula in another five billion years.

As a main- sequence star, the Sun's hydrogen supply should last about 10 billion years from the zero- age main sequence until its evolution to the giant stages.

When the outer envelope of a red giant escapes, the remaining carbon core is called a

Supergiant stars are burning different fuels in several shells around the core.

It is the formation of iron in an evolved giant's core that triggers a Type II supernova event.

Virtually all the carbon- rich dust in the plane of the galaxy originated in

The density of white dwarf stars is about a million times that of the Sun.

Of the elements in your body, the only one not formed in stars is

Does a planetary nebula have anything to do with planets? Explain.