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Lecture 9

Lecture 9 Notes

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Astronomy & Astrophysics
Course Code
Stefan Mochnacki

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Cliff Lau University of Toronto AST201 Lecture 9 (February 10, 2011) Temperature colourstrength of spectral lines Distance parallax Luminosity distance + apparent brightness Spectral type colourtemperaturepattern of spectral lines Luminosity class shape of spectral lines We can organize much of what we know about them using the H-R diagram Stars do not live forever; they are born and they die Most distant stars we can see are blue because although these stars are rare, they are extremely luminous But these stars dont live long, so they mostly die where they were born; therefore, to find the s
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