exam 2 - Add to this guide what was not included in Exam 1...

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The Interstellar Medium and Star Formation: The Birth of Stars Add to this guide what was not included in Exam 1 from Study Guide 1! (sections 17.6-17.10) What does the interstellar medium contain? Know how to identify and understand the different nebulae types o Emission (keywords: HII regions, recombination) o Reflection o Dark Extinction of starlight due to the interstellar medium o greatest in the ultraviolet, violet, indigo, blue. o caused by dust particles Interstellar reddening Where do protostars form? What may cause a gas cloud (nebula) to collapse? Prior to reaching the main sequence and igniting fusion, what is the major form of energy production for a collapsing nebula that will produce a star? How do protostars evolve into main sequence stars o how it depends on its mass (one-solar-mass, High-mass, Low-mass) Why are protostars difficult to observe? Why astronomers observe the galaxy at millimeter (radio) wavelengths (CO and its relation to H 2 )? Stellar Evolution Preliminaries Understand how to build a successful model of a star o hydrostatic equilibrium o energy transport o energy generation Understand the
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exam 2 - Add to this guide what was not included in Exam 1...

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