Lecture 18

Lecture 18 - oday (Fri.) in oday (Fri.) in Astro Astro 3 3...

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Unformatted text preview: oday (Fri.) in oday (Fri.) in Astro Astro 3 3 z Finish Chapter 10 Measuring the Stars, on to Chapter 11 The Interstellar Medium z Cell phones off now, please z Online quiz #6 covering chapters 10 and 11 due Monday by 10 p.m. z Midterm #2 next Friday: Chapters 6-11 transparencies will be put on the class web site this afternoon All about Stars: Chapters 10-12 Today (finish chapter 10): How do we know how far away the stars are? What types of stars exist, and why are there different types? Today (chapter 11): Clouds of gas and dust in the Milky Way galaxy Observations of star-forming regions Theory of star-forming Next Wednesday (chapter 12): How stars evolve with time Some fade away, some explode Chapter 10 Measuring the Stars Units of Chapter 10 9 The Solar Neighborhood 9 Luminosity and Apparent Brightness 9 Stellar Temperatures 9 Stellar Sizes 9 The Hertzsprung-Russell Diagram Extending the Cosmic Distance Scale Stellar Masses 10.1 The Solar Neighborhood The 30 closest stars to the Sun: 10.3 Stellar Temperatures The color of a star is indicative of its temperature . Red stars are relatively cool, while blue ones are hotter. (Chapter 2 thermal radiation) 10.3 Stellar Temperatures lackbody thermal radiation: bservations at two avelengths are nough to define the temperature: 10.3 Stellar Temperatures The seven spectral types corresponding to different surface temperatures . From highest to lowest, those categories are: O B A F G K M Textbook mnemonic for remembering: Oh Be A Fine Girl/Guy Kiss Me 10.4 Stellar Sizes Stellar radii vary widely: Summary of Chapter 10 thus far Distance to nearest stars measured by parallax Apparent brightness depends on distance and absolute luminosity Spectral classes correspond to different surface temperatures 10.5 The Hertzsprung-Russell Diagram The H-R diagram plots stellar luminosity against surface temperature : These are the 80 closest stars to us; note the dashed lines of constant radius . The darkened curve is called the Main Sequence , as this is where most stars are....
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This note was uploaded on 04/16/2008 for the course ASTR 3 taught by Professor Hauser during the Fall '07 term at UCLA.

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Lecture 18 - oday (Fri.) in oday (Fri.) in Astro Astro 3 3...

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