Astronomy

H-R Diagram: Mapping the Stars by Luminosity and Surface Temperature

Read! Pages 532-536

PowerPoint Project #2Physical Science AM Block

• Sign out Laptop responsibly• Write down computer #• Respect internet agreement on school

research only (No shopping, social media, off task surfing)

• Log Off and Return at period’s end• Plug in electricity in proper slot• Sign return/in correct computer #

Internet Research ProjectType of Stars in the Universe

Slide 1

Types of Stars in Universe

• PowerPoint Slide Show Explain Concept and add picture or diagram.

• Slide #2 Main Sequence StarsExplain: How are Main Sequence Stars

classified? (Color, temperature, size)Life Span ( How long do these stars exist?)ExampleImport Picture or Diagram

Main Sequence StarsSlide 2

• Energy produced by fusion of hydrogen into helium and heavier elements

• Most stars are in the main sequence

• Equilibrium exists between gravity collapsing the star and nuclear fusion exploding the star.

Supergiant StarsSlide 3

• Largest stars in universe• 10 to 1 Million times

bigger than our Sun• High mass stars

consume all their hydrogen fuel in a shorter time than our sun (“just” a few million years).

• Detonate as supernova

Giant StarsSlide 4

• Low mass stars that deplete their hydrogen fuel at the end of their life span enlarge to “Giant” status.

• Betelgeuse is a red giant, 20 times bigger and 14,000 times brighter than the Sun.

White Dwarf Stars Slide 5

Stars likeOur Sun (low mass)Deplete their hydrogen fuelAt the end of their life span and become a WhiteDwarf. First, the star collapses which heats it up again into a Red Giant for a “short time” ( 1 Billion years – compared to 10 Billion years in its “regular” main sequence life span. Helium (product from fusion) is now transformed into carbon).

Information about STARSSlide 6

• How do color and temperature provide important information about stars in the universe?

• What are the ranges of color?• What are the ranges of temperature?• Import picture or graph.

NebulaSlide 7

• Why are Nebulas so important to the formation of stars?

• Example (name)• Import Picture

SupernovaSlide 8

• What is a Supernova?• Why are they so important to the formation of

the larger elements in the universe?• Example (name)• Import picture