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Exam 12: Stellar Evolution

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Question 21

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List the two basic types of intrinsic variable stars.

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1 Cepheid ...

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Question 22

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The fusion of helium into carbon will take a temperature of at least

A) 5 million degrees Kelvin
B) 10 million degrees Kelvin
C) 50 million degrees Kelvin
D) 100 million degrees Kelvin
E) 600 million degrees Kelvin

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Question 23

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The helium flash stage will always completely destroy a star and any planets nearby it

As a main sequence star evolves off the main sequence, the helium core is contracting while the outer envelope is _______________.

Observing star clusters will give astronomers needed data for stellar evolution because all the stars in the cluster have the same ____.

Observing star clusters will give astronomers needed data for stellar evolution because all the stars are the same age.

Briefly explain why there is a main sequence on the H-R Diagram.

The age of a star cluster can be approximated by finding its turnoff point in the distribution of data points that represent stars on the H-R Diagram.

Why is there an upper end in the main sequence of the H-R diagram?

Because of the period-luminosity relation for Cepheids and RR Lyrae variable stars, astronomers are able to _____

As a one-solar-mass star evolves off the main sequence, it will probably undergo a _____.

Globular clusters have approximately how many stars?

The lower limit for a main sequence star is _______________ solar masses.

The Instability Strip on the H-R Diagram is the location for what type of stars _______________.

Astronomers determine the internal structure of a star by using stellar models, since they cannot "see" into the interior of a star.

Figure: Main-Sequence Stars What is the approximate age of the star cluster in the accompanying figure?

What is the upper limit of a brown dwarf's size?

Cepheid and RR Lyrae variable stars change their brightness by ____.

The energy emitted from the surface of a main sequence star is less than the energy generated in the core.

Match the following list of events or labels to the location on the figure. The figure represents the post-main-sequence phase of a large mass star (upper curve) and a low mass star (lower curve). Use one letter for each question. "A", "B", and "C" are the axes of the diagram.