YELLOW DWARFS• Color: Appear yellow

• Gases Burned: Fuse H, He to generate into light

• Size : Small 80-100% mass of the sun

• Surface Temperature: 5300-6000 K

• Area: Main sequence stars

• Death/Next Stage: Expand into a red giant

• Lifetime: Generally will last for 10 billion years

OUR SUN IS A YELLOW DWARF

RED DWARF• Color: Appears red

• Gases Burned: H used to the last drop

• Size : Small 7.5% - 100% size of the sun

• Surface Temperature: Cool, under 4,000K

• Area: Main sequence stars

• Death/Next Stage: Fade to brown stars

• Lifetime: Generally will last for 10 trillion years

RED DWARF

RED GIANT• Color: Appears orange

• Gases Burned: 1st H, then after swell uses heavier elements

• Size : 100 times bigger then original

• Surface Temperature: Becomes cooler, under 6500 K

• Area: Evolve from main sequence stars

• Death/Next Stage: Collapse to white dwarf after fuel is gone

• Lifetime: Generally will last for hundreds of billions of years

RED GIANT

BLUE GIANT• Color: Appears blue

• Gases Burned: He

• Size : Huge

• Surface Temperature: Hot, 20,000 K

• Area: Post main sequence stars

• Death/Next Stage: Expand and cool to red giants or expand into supergiants

• Lifetime: Short, tens or hundreds of million years

BLUE GIANT

SUPERGIANT• Color: Red or Blue

• Gases Burned: Carbon

• Size : Largest known 10-70 Suns

• Surface Temperature: Red 3500-4500 K, Blue 20,000-50,000

• Area: Post Main Sequence

• Death/Next Stage: Supernova to a black hole

• Lifetime: Short, 30 million- few thousand years

SUPERGIANT

WHITE DWARF• Color: Appears white

• Gases Burned: He

• Size : Small, 60% of original mass into size of the Earth

• Surface Temperature: Hot, but will slowly cool down

• Area: Post Red Giant

• Death/Next Stage: Cold dark black dwarf

• Lifetime: Long, Age of the Universe

WHITE DWARF

BROWN DWARF• Color: Can’t visibly see

• Gases Burned: No gases

• Size : small, .07 solar masses

• Surface Temperature: Cool

• Area: Unknown

• Death/Next Stage: Unknown

• Lifetime: Unknown

BROWN DWARF

NEUTRON STAR• Color: Appears white

• Gases Burned: Stellar remnant, neutrons, small amount of H

• Size : Small, 5-10 miles

• Surface Temperature: Extremely hot, 1 million degrees but surface cools

• Area: Post stars

• Death/Next Stage: Dissolves, slowly stops spinning

• Lifetime: 10 billion years

NEUTRON STARS

Star Type Luminosity

Yellow Dwarf 1 solar unit (as bright as the sun)

Red Dwarf 10-3 solar units (.01)

Red/Blue Giants 102 solar units (100)

Red/Blue Supergiants 105 solar units (10,000)

Neutron Star 10-2 solar units (.1)

White Dwarf 10-3 solar units (.01)

Brown Dwarf Below 10-5 solar units (.0001)