Astronomy 1021 Chapter Notes - Chapter 13: Stellar Evolution, Solar Mass, Degenerate Matter
12 Dec 2018
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Document Summary
Gravity will attract particles and they will come together. As they come closer, temp and pressure increase creating a counter force separating all these particles interstellar medium (ism): space between the stars. Explains how the solar system was formed. Observations of young star clusters show that they are still embedded in clouds of gas and dust. Ism has an overall composition very similar to our suns: h and he; small solid grains referred to as interstellar dust. Combination can be seen in a single image. Naked eye nebula (orion): interstellar gas cloud with lots os h emission. Dust is less effective at absorbing in the infarared. Clouds can be opaque at visible wavelengths but transparent in the infrared. A star is the continuing ght of a self-gravitating mass of gas against gravity. Most interstellar clouds have enough internal pressure to resist gravity and therefore they do not collapse. Collapse requires: high mass and less pressure.
