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The Life Cycle of Stars
The Life Cycle of Stars
“protostar”
The Life Cycle of Stars
“protostar”
“Main Sequence” (longest phase in a star’s cycle
The Life Cycle of Stars
“protostar”
“Main Sequence”
“Red Giant”
The Life Cycle of Stars
“protostar”
“Main Sequence”
“Red Giant”
“White Dwarf”
The Life Cycle of Stars
“protostar”
“Main Sequence”
“Red Giant”
“White Dwarf”
• Cycle for Massive Star:
• Nebula• Main Sequence• Super Red Giant• Neutron Star,
Pulsar, or Black Hole forms at end of its life cycle
Star Phases: Charted on H-R Diagram
Explaining the H-R Diagram
• “H” = Hertzsprung
• “R” = Russell• graph of
temperature and brightness of all stars
A Closer Look at the H-R Diagram
Star Phases: Charted on H-R Diagram
• The H-R Diagram shows the relationship between absolute magnitude, luminosity, classification, and effective temperatures of stars.
• The H-R Diagram can be used to define different types of stars.
Explaining the H-R Diagram
• Temperature: horizontal (bottom) axis.
• hotter at left• cooler toward
right
Explaining the H-R Diagram
• Brightness: vertical (left side) axis.
• brightest stars near top
• dim stars near bottom
Explaining the H-R Diagram
• A star’s position on the diagram will change as it moves from its “birth” to its “death”.
Your Turn to Practice
• Get a copy of HR Diagram. Color the different sections of the HR Diagram using colored pencils. Answer questions 1-15 using your notes and textbook.
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