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Stars

transition from star property lab to life stages
by

Chad Sindaco

on 21 October 2016

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Transcript of Stars

Star
Properties
Temperature
Color
SiZe
magnitude
Mr. Sin says,
"positives are dim"
G R A V I TY
Collapse from gravity
Temperature increases
FUSION - the process in which light nuclei combine at extremely high temperatures, forming heavier nuclei and releasing energy
cause and effect
IF critical temperature
reached

F u s ion starts
Fusion releases energy causing outward pressure ...
...opposes force of collapse due to gravity
gravity = outward pressure = (equillibrium - same size)
gravity > outward pressure/fusion = (collapse)


outward pressure/fusion > gravity = (expansion)
Mass of Stars
Large Stars
Small - medium Stars
Burn fuel quickly
Short lifespan
Become Supernovas
(new nebula)
Burn fuel slowly
Long lifespan
Become White Dwarfs
long waves
low frequency
cool temp's
short waves
high frequency
hot temp's
Summary
Video

Co
lo
r of Stars

white dwarfs give off light
after collapse and slowly cool
and become more dim
super nova can be
very bright and provide
ingredients for new nebula
The balance or lack of balance
between outward pressure from
fusion and collapse due to gravity
determines what stage a star is in
and when it will transition to a
different stage
(really HOT)
The outward pressure from fusion depends on how much fuel is available
=
Gravity
Fusion
G > F
F > G
F = G
Massive
Small/Medium
color is based on temperature
Magn
of Stars

= BRIGHT
BIG
small (dwarf )
= dim
Magnitude is based on size
-10
-5
0
+10
+5
-15
Absolute Magnitude
R
O
Y
G
B
I
V
Life Stages of a Star
Outside
tem
pera
ture of Stars

temperature is based on size
energy is spread out
star is
cool
energy is concentrated
star is hot
giant
dwarf
of Stars
s
i
Z
e
ITU
de
size is based on fusion and
the balance of fusion and gravity
He C = very very hot in core
large outward push
H He = hot
outward push
C = no fusion
gravity > fusion
What can be learned about a star's lifecycle by examining its characteristics?
Why does a star's properties change?
How does a star change from one life stage to another?
main
sequence
F U S ION
N
E
B
U
L
A
Collapse - Temp increases
Fusion leads to outward push
Main Sequence - Equilibrium
Fusion
slows
- Gravity collapses star - Temp increases
Critical temp reached
F U S ION starts (H to He)
+1
+1
+2
+6
Critical temp reached
F U S ION starts (He to C
)
+2
+2
+2
F U S ION
Fusion leads to outward push
red GIANT = equilibrium
Fusion
slows
- Gravity collapses star
Temp increases
critical temp NOT reached
white
dwarf
Full transcript