Jumpstart 9/9/11

1
Jumpstart 9/9/11

• How long would you expect a massive star to live
  in comparison to a low mass star? Explain your
  answer.

2
Lifecycle of a Star
3
/Act One/
The Life of a Small to Medium Mass Star
4
Nebula- cloud of gas dust
5
Protostar
6
Small Protostar
Brown Dwarf Too small to create enough heat to
start fusion
7
or
8
Main Sequence Star
The protostar gains enough mass to begin
fusion. All main sequence stars fuse hydrogen
9
Red Giant
Small to medium main sequence star runs out of
hydrogen begins fusing helium
10
Planetary Nebula
A Red Giant completely stops fusing the outer
layers of the star are driven away
11
White Dwarf
The left over core of a star. A white dwarf may
only be the size of Earth, but it has a mass
equal to ½ of the Sun.
12
Black Dwarf
A white dwarf cools off over trillions of
years until it no longer emits light
13
(No Transcript)
14
/Act Two/
The Life of a High Mass Star
15
Nebula- cloud of gas dust
16
Protostar
17
Massive Main Sequence Star
Massive main sequence stars fuse hydrogen much
faster than small or medium stars
18
Red Supergiant
Massive main sequence star runs out of hydrogen
begins fusing helium, carbon, oxygen, etc.
19
(No Transcript)
20
Supernova
Fusion stops. The star collapses creates a huge
explosion.
21
Neutron Star
Super dense core of a star left over after a
supernova. Only 5 to 15 MILES in diameter, but
have a mass 1.5 2 times that of the Sun.
22
or
23
Black Hole
Stars with masses of 25 to 50 times of the
Sun form black holes after a supernova. The
leftover core of the star is so dense that it
causes gravitational collapse.
24
(No Transcript)
25
(No Transcript)
26
Quick Write

• How is the life cycle of a star related to the HR
  diagram? Explain your answer.