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Stellar Evolution - Star Birth

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by

Scott Harnath

on 17 August 2016

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Transcript of Stellar Evolution - Star Birth

Cepheid Variable Stars
Cepheids undergo a similar process to that of the Brown Dwarf. They are unstable stars that keep on changing size. Most stars reach an equilibrium state whereby the force of gravity causing it to collapse is balanced by the pressure exerted from the Fusion reactions in it's core. In Cepheids, for some reason the star oscillates around this equilibrium, getting brighter and dimmer over a regular period
Star Birth
Stellar Evolution - Star Birth
Where do stars come from?
Nebulae
Stars begin in massive clouds of gas known as Nebulae
That's a lot of gas!
To say that Nebulae are large is an understatement... they are MASSIVE!!!!!

But how do they turn into stars?

It begins when small pockets of the nebula begin to collapse in upon themselves due to gravity...
FUSION!!
Once fusion begins the stars life truly begins
... and Rise...
... UNTIL...
As the pocket of gas gets smaller, the gas becomes more densely packed and the temperature begins to rise...
... and rise...
...and rise....
Main Sequence Stars
When a Star begins to consistently undergo Hydrogen Fusion, it is described as a Main Sequence Star.

These stars are in the prime of their lives, busily turning low order elements into higher order ones.
But not all stars are the same
There are different types of stars. What causes them to be so different is how big they are
More Gas = More Blue
The more gas a star has, the hotter it is and the more Blue it is. It is a bit like the flame on a Bunsen Burner, the hot flame is blue while the yellow flame is cool.
A Brown Dwarf
A Brown Dwarf is a star that isn't quite large enough to undergo stable Hydrogen Fusion.

It is also known as a failed star as it is large enough to collapse under gravity but when Fusion starts, the energy released causes it to expand so much that the fusion then stops again.

They can range in size from about 13-80 Jupiters in Mass.
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