Chapter 18 - Physics1902 BetweenTheStars Lecture W7.a...

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Physics 1902 Between The Stars Lecture W7.a Chapter 18
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First steps What are we going to make a star out of? Clouds of gas/dust which collapse?
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So we want to look at gas/dust clouds in  the galaxy We actually see different types of clouds Milky Way
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M8 M20 Triffid nebula Emission nebula kept hot by at least one O or B star (hidden in dust)
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Orion contains a number of interesting gas and dust clouds
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Orion Nebula Orion nebula shows both H II regions and dust clouds Total mass 10 6 M Sun
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Horse head nebula is a dark dust cloud in front of an emission nebula
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Coal sack nebula in front of milky way
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M16 or Eagle nebula is another H II region with dusty regions
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This Hubble image of M16 is one of the most commonly seen picture from the Hubble mission The pillars are star forming regions
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Other important types of nebulae Pleiades reflection nebula
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How can we learn about the makeup of  these regions The main tool is spectroscopy For emission nebulae we see a spectrum with bright lines
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Emission Nebula NGC2346
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Emission Nebula Spectrum
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Chapter 18 - Physics1902 BetweenTheStars Lecture W7.a...

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