H-R Diagrams Flashcards
How many stars are in the Main sequence
90%
Luminosity on the diagram increases or decreases
Increasing
Does temperature on an H-R diagram increase or decrease
Decrease
Massive stars age the same as low mass stars t/f
False
What are the layers of a star in order from bottom to top
Core Radiation Zone Convection Zone Photosphere Corona
When drawing out the layer of the star what does the star look like? And what items need to be added in the layers?
The layers drawn out look like a pizza with waves at the top
Arrows need to be added going up in the radiation zone
Convection current arrows need to be added in the convection zone
How old is our sun
4.6 billion years old
What is the estimation of stars in the universe
over 1*10^24
What is the suns makeup
73% hydrogen and 25% helium
Where is a star formed
nebula
What are the steps when the star is born
Gasses in the nebula contracts and start to spin flattening into a disk
The disk spins faster and faster attracting more gas and creating a hot dense core called a proto-star
When it gets enough it begins nuclear fusion and after thousands to millions of years it becomes a star
What happens when a small star die
the outer layer expand into a red giant
the core collapses leaving lots of gas in the outer area called a planetary nebula
The outer gasses get ejected leaving a small white dwarf star
What happens when a large and massive star die
the outer layer expand into a super giant
the core collapses causing a super nova explosion
outer gasses get ejected
Large star-leaving an incredibly dense neutron star
Massive star-leaving an infinitely dense black hole
what color is the coldest and what color is the hottest
Red-coldest
Blue-hottest
What dies off first blue or red
blue
describe how a drawing of a neutron star looks like
An egg with smoke coming from the top and bottom
what does the graph of a life cycle of a star
stellar nebula–>average star–>red giant–>planetary nebula–>white dwarf
or
stellar nebular–>massive star–>red supergiant–>supernova–>neutron star or black hole
on the notes on the back what is the death of a low mass star
evolve-never evolve into a red giant
remain-stable main-sequence until hydrogen gone
collapse-white dwarfs
what are the notes on the back of a planetary nebula
This is left when a giant loses its outer layers of gas–>leaves the core–>core will become a white dwarf
what are the colors of the H-R diagrams from left to right
Blue White Yellow Orange Red
once a star runs out of hydrogen it runs on
helium
what does a star use for fuel
hydrogen
what are the notes on the back of a neutron star
supernova explosion core condense neutrons
rotates very rapidly-faster than blender
gravity so extreme-Everest will be a centimeter high
hot-glow in x-ray
the gravity of a neutron star is so great that Everest would be
a centimeter tall
which stars have high mass and short life
stars with higher luminosity or stars at the top of the diagram
which stars have low mass and long life
stars with lower luminosity or stars at the bottom of the diagram
a star that fuses hydrogen faster will be hotter or cooler
hotter
