CHAPTER 27: THE SUN-EARTH-MOON SYSTEM
CHAPTER 29: STARS
Section 29.1 The Sun
1. Identify four unique characteristics of the Sun.
[pic]
2. State three facts about each layer of the Sun’s atmosphere in the table below.
|Photosphere |Chromosphere |Corona |
|1. |1. |1. |
| | | |
| | | |
| | | |
|2. |2. |2. |
| | | |
| | | |
| | | |
|3. |3. |3. |
| | | |
| | | |
3. Sequence the solar activity.
_______ The cycle progresses to maximum spots.
_______ The magnetic field returns to its original polarity.
_______ The cycle starts with minimum spots.
_______ The Sun’s magnetic field reverses in polarity.
4. Analyze Figure 19.6 in your text. Make your own sketch of a cross section of the Sun. Label the following in your sketch: the core, the radioactive zone, the convective zone, radiation, convection
5. Compare continuous, emission and absorption spectra. Write each characteristic in the correct location in the diagram below.
-appears as bright lines -produced by a solid, liquid, or gas
-has no breaks in spectrum -comes from a non-compressed gas
-appears as a series of dark bands -visible light arranged by wavelength
[pic]
6. Explain solar composition by completing the sentence.
The sun consists of ___________________, about 70.4 percent by mass, and _________________, ______ percent, as well as a small amount of other ____________.
Section 29.2 Measuring Stars
1. Organize information about star clusters by completing the diagram below.
[pic]
2. Identify six basic properties that scientists use to categorize stars.
a. _____________________ d. _____________________
b. _____________________ e. _____________________
c. _____________________ f. _____________________
3. Write a review question related to the classification of stars. Then write a second review question related to wavelength shifts. Give the answer to each of your questions.
Question:________________________________________________________________
Answer: ________________________________________________________________________________________________________________________________________________
Question:________________________________________________________________
Answer: ________________________________________________________________________________________________________________________________________________
4. Analyze Table 29.2 in your text. Describe the general characteristics of stars (size, temperature, and absolute magnitude) found in different locations on the H-R diagram.
|Upper-left corner |Upper-right corner |Lower-left corner |
| | | |
| | | |
| | | |
Section 29.3 Stellar Evolution
1. Draw a diagram illustrating the two different life cycles a star may take based upon its mass. Include the following terms: super nova, red giant, black dwarf, super giant, protostars, nebula, white dwarf, black hole, neutron star
2. Sequence the steps in the life cycle of the Sun.
_______ converts hydrogen into helium in its core
_______ star contracts back to normal size and becomes stable
_______ As the core runs out of hydrogen and then helium, the core contracts and the
outer layers expand, cool, and become less bright.
_______ Stars are born in the nebulae.
_______ outer layers expand again and are driven off entirely leaving a planetary nebula
_______ the star becomes a red giant, the core becomes hot enough to become carbon
_______ the core becomes exposed and is a white dwarf
_______ the star loses gas from its outer layers
_______ Huge clouds of dust and gas collapse under gravitational forces, forming
protostars.
3. Compare the evolution of a massive star with the evolution of the Sun using a Venn Diagram. Write each description below in the correct place.
-begins as a nebula -loses less of its mass
-becomes a red giant once -loses much of its mass
-becomes a red giant several times -more reaction phases
-fewer reaction phases
-----------------------
Emission
Continuous
Absorption
The Sun
_____________
clusters
Star clusters are
_____________
clusters
because the stars are not ______________ packed
Because the stars are densely packed into a ______________ shape.
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