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Name: ______________________________
Period: __________
Study Guide/Review/Extra Credit
H-R Diagram Quiz
You may earn up to half of your points back on your H-R Quiz. In order to do so, you must
submit the incorrect answers with an explanation of why your new answer is correct.
Example
1. What is the proper name of the H-R Diagram
A. Heat-Radiance Diagram
B. Hertzsprung-Russell Diagram
C. That is the proper name
D. Horizontal-Redshift Diagram
My corrected answer is B, as the H-R Diagram is named for the two astronomers, Hertzsprung
and Russell who were its main contributors.
Review Sections
Every 6 points that are correct, you will earn 1 extra credit point on the exam. Up to 18 points
are available.
The Life Cycle of Stars
Section One – Sequencing (6 points)
The stages below are not in the right order. Number the stages in the correct order.
_____ The star begins to run out of fuel and expands into a red giant or red super
giant.
_____ Stars start out as diffused clouds of gas and dust drifting through space. A single
one of these clouds is called a nebula
_____ What happens next depends on the mass of the star.
_____ Heat and pressure build in the core of the protostar until nuclear fusion takes place.
_____ The force of gravity pulls a nebula together forming clumps called protostars.
_____ Hydrogen atoms are fused together generating an enormous amount of energy
igniting the star causing it to shine.
Section Two – Vocabulary (7 points)
Match the word on the left with the definition on the right.
____ black dwarf
A. star left at the core of a planetary nebula
____ white dwarf
B. a red super giant star explodes
____ nebula
C. what a medium-mass star becomes at the end of its life
____ protostar
D. a large cloud of gas or dust in space
____ supernova
E. exerts such a strong gravitational pull that no light escapes
____ neutron star
F. the earliest stage of a star ’s life
____ black hole
G. the remains of a high mass star
Section Three – Understanding Main Ideas - Low Mass Star (7 points)
____ 1. Red giant
____ 2. Where fusion begins
____ 3. Nebula
____ 4. Black dwarf
____ 5. The stage the sun is in
____ 6. White dwarf
____ 7. Planetary Nebula
Section Four – Understanding Main Ideas - High Mass Star (7 points)
____ 1. Black Hole
____ 2. Supernova
____ 3. Protostar
____ 4. Gravity causes this to condense into a protostar
____ 5. Main sequence star
____ 6. When a star begins to run out of fuel and grows larger
____ 7. Neutron star
Classifying Stars (28 points)
Create a chart of the spectral class, color and temperature relationship of stars
Class
Color
Temperature
For each star give its: (15 points)
- Color
- Spectral Class
- Size
1.
Vega 2.8R
10000K
2. Betelgeuse 630R 3000K
3. Sun
1R
6000K
4. Rigel 70R
20000K
5. Arcturus
21R
H-R Diagrams
4000K
On the H-R Diagram (9 points)
Label the x-axis
Label the y-axis
Color in each section with the appropriate color.
Label each of the dotted sections:
- Giants
- Main Sequence
- Super Giants
- White Dwarves
Calculate the following distances (3 points)
a. .09’’
b. 0.2''
c. .005''
Describe what happens to the brightness in each of the following scenarios. Please use
numbers, in your explanation (3 points)
a. Luminosity is quartered
d. Distance is tripled
c. Distance is quartered
Describe what happens to the size in each of the following scenarios. Please use numbers
in your explanation (3 points)
a. Luminosity is tripled
b. Luminosity is quartered
c. Temperature is quadrupled
Conceptual Questions to Consider (24 points)
What is the difference between type 1 and type 2 supernova?
What is the relationship between a star’s mass and it’s lifetime?
Why can we say a star is always trying to stay in equilibrium?
What is the evolutionary process of a star like our sun?
How are stars “born”?
What are blue stragglers, how are they formed and where are they located?