The Life Cycle of Stars The Life Cycle

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The Life Cycle of Stars

The Life Cycle of Stars

The Life Cycle of Stars “protostar”

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” (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”

The Life Cycle of Stars “protostar” “Main Sequence” “Red Giant” “White Dwarf”

The Life Cycle of Stars “protostar” “Main Sequence” “Red Giant” “White Dwarf”

The Life Cycle of Stars • Cycle for Massive Star: • Nebula • Main

The Life Cycle of Stars • Cycle for Massive Star: • Nebula • Main Sequence • Super Red Giant • Neutron Star, Pulsar, or Black Hole forms at end of its life cycle “protostar” “Main Sequence” “Red Giant” “White Dwarf”

Star Phases: Charted on H-R Diagram

Star Phases: Charted on H-R Diagram

Explaining the H-R Diagram • “H” = Hertzsprung • “R” = Russell • graph

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

A Closer Look at the H-R Diagram

Star Phases: Charted on H-R Diagram • The H-R Diagram shows the relationship between

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 •

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

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

Explaining the H-R Diagram • A star’s position on the diagram will change as it moves from its “birth” to its “death”.

Explaining the H-R Diagram • You. Tube Style

Explaining the H-R Diagram • You. Tube Style

Your Turn to Practice • Get a copy of HR Diagram. Color the different

Your Turn to Practice • Get a copy of HR Diagram. Color the different sections of the HR Diagram using colored pencils. Answer questions 115 using your notes and textbook.