Spectral Class
Class has the lowest temperature
What is M?
Wide, outermost layer of a star’s atmosphere
What is the Corona?
A graph that plots luminosity vs. the temperature of stars.
What is the Hertzsprung-Russell (HR) Diagram?
Stars form deep inside clouds of dust and gas.
What is a nebula?
Star collapses, releases energy, and swells into a red giant.
What is a Red giant/supergiant?
Class is a Blue-white star
What is Class B?
Shell of cooler hydrogen above a star’s core
What is the Radiative Zone?
Measured on the X and Y axis
What is Y-Axis = increasing luminosity / X-Axis = decreasing temperature?
Protostar will pull in surrounding gas until their core is hot and dense enough for ____________ _____________to begin.
What is nuclear fusion?
Helium in core is gone and star casts off its gases.
What is a Planetary Nebula?
The temperature of a Red star class M.
What is Lowest temperature/ <3500?
The apparent surface of a star.
What is the Photosphere?
· Star that fuses hydrogen and helium in its core · Hot, bright stars in upper left to cool, dim stars in lower right
What is the Main Sequence?
A star becomes a ______________________ as soon as it begins to fuse hydrogen into helium in its core.
What is a main sequence star?
Area in space that is so dense that nothing, including light, can escape is gravitational pull.
What is a Black Hole?
The class of our Sun
What is G?
The orange-red layer above the photosphere.
What is the Chromosphere?
· Core of giant star no longer supports fusion · Bottom left of HR diagram
What are dwarf stars?
Gravity causes the densest part to collapse, forming a_________, a cloud of gas and dust in space that develops into a star.
What is a protostar?
Remaining hot, dense core after outer layers are gone.
What is a White Dwarf?
On the Morgan-Keenan System, what two things are related?
Color and temperature
Above the radiative zone, where hot gas moves up toward the surface and cooler agas moves deeper into the interior.
What is the Convection Zone?
· Much larger radius and luminosity · Top right in HR diagram
What are giant and supergiants?
3 Things very massive stars can turn into.
What is Red supergiant, supernova or black hole?
Enormous explosion that destroys a star; AKA star death.
What is a Supernova?