Classifying Stars A brief overview of how stars are formed and how to classify them Enter.
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Transcript of Classifying Stars A brief overview of how stars are formed and how to classify them Enter.
Classifying Stars
A brief overview of how stars are formed and how to classify them
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Click the links below to navigate
How a star is formed
The mass of a star
Life cycle of a star
Stellar classification
Types of stars- Part I
Types of stars- Part II
Hertzsprung-Russell Diagram
A look at the H-R diagram
Extra practice
About the author
Resources
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How is a Star Formed?
Stars begin their lives as nebula
Gravity then pulls together dust and gas from the nebula to form a
protostar
These clouds of dust and hydrogen gas then collapse under their own
gravity
The center of this cloud then becomes very hot and nuclear fusion
occurs.
This process releases so much energy that the star then shines
with its own light.
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Stars are Different SizesStars have a life cycle that depends on the initial
mass of the star.
The more mass a star has, the faster it will burn.
Low mass stars, or small stars, survive for billions of years. These small stars die quietly, and in their
place, a small white dwarf is left behind.
High mass stars, or large stars, survive for a few million years.
These large stars die in supernova explosions, and in their place, a
black hole is left behind. Quit
Summary: Life Cycle of a Star
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Click on the picture above to watch a video from the history channel on the life cycle of a
star!
Videos to Watch
• http://www1.teachertube.com/viewVideo.php?video_id=73345
• http://www.youtube.com/watch?v=80eMTnnLjhs
• http://www.youtube.com/watch?v=HEheh1BH34Q
What is Stellar Classification?
The classification of stars is based on the elements they absorb and their
temperature, and are listed from hottest to coldest
Class Temperature Conventional Color
Mass(The Sun=1)
Radius(The
Sun=1)
Luminosity
(The Sun=1)
O 30,100–60,000 K blue 60 M☉ 15 R☉ 1,400,000 L
☉
B 10,100–30,000 K blue white 18 M☉ 7 R☉ 20,000 L☉
A 7,600–10,000 K white 3.1 M☉ 2.1 R☉ 80 L☉
F 6,100–7,500 K yellowish white 1.7 M☉ 1.3 R☉ 6 L☉
G 5,100–6,000 K yellow 1.1 M☉ 1.1 R☉ 1.2 L☉
K 3,600–5,000 K orange 0.8 M☉ 0.9 R☉ 0.4 L☉
M 2,000–3,500 K red 0.3 M☉ 0.4 R☉ 0.04 L☉
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Types of Stars
Type O Stars in Orion’s Belt
Type B stars in the Pleiad
es open star
cluster
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Types of Stars (continued)
Above: Type A Star- VegaBelow: Type A Star-Sirius
Type F Star- Procyon
Type G Star- The Sun
Type K Star- Arcturus
Type M Star- Betelgeuse
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The Hertzsprung-Russell Diagram
The H-R Diagram shows the relationship between absolute magnitude, luminosity, classification, and
effective temperatures of stars.
It is a graph that plots star color versus its luminosity.
The H-R Diagram can be used to define different types of stars.
It can also be used by scientists to measure how far away a star cluster is from the Earth.
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A Look at the H-R Diagram
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Star Cut-OutsFor your assignment, print this slide, color the stars the appropriate color and cut out. Then, put the stars in order from coldest to
hottest
Betelgeuse
3,100 C
0.04 L
Aldebaran
5,000 C
0.4 L
The Sun
5,400 C
1.2 L
Polaris
6,100 C
6 L
Vega
10,000 C
80 L
Spica
31,000 C
1,400,000 L
Regulus
20,000 C
20,000 L
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ResourcesLife Cycle Video:
Teacher Tube
Images:Wikipedia- NebulasDeep Space Photos
Star Field ObservatoryHubble Information Center
H-R Diagram
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