The Milky Way Galaxy Chapter 9 Notes - The Milky Way Galaxy...

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The Milky Way Galaxy Chapter 916/05/2016 19:15:009.1 The Discovery of the GalaxyThe Great Star Systemomilky way is wheel or disk shapedoWilliam and Caroline Hershel said star system is disk shapedand has holesHoles caused by dense clouds of gas and dust blockingthe view of more distant starsSun and earth near center they said of milky wayThe Size of the Milky WayoNovae and supernovae change in brightnessoPeriod of Pulsation- the time it takes a star to complete a cyclefrom bright to faint to bright againooHenrietta Leavitt study Small Magellanic CloudoBrightest variable stars had the longest periodoCepheeid Variable stars- stars that vary in brightness and canfind how far away they are pulsation of 1-60daysLie in region of HR diagram called Instability stripPulsate when in and stop pulsating when outoMassive stars are larger and PULSATE sloweroSmaller stars pulsate fasteroPeriod Luminousity Relation- the relation between period ofpulsation and intrinsic brightness among Cepheid variablestarsoEx Polaris and pulsation period is 4daysStar Clusters and the Center of the GalaxyoHarlow Shapely Shaped our galaexyoOpen cluster on the milky wayoGlobular clusters are widely scatteredoFind distance if can calculate true luminoustiy of variable starsoProper Motion- rate at which a star move across the sky,measured in arc seconds per yr
oCalibrated to find distanceoInverse square lawoWhy did scientist think we was in the centerCuz space is filled with gas and dust that dims the viewof distant starsoWe not in centerAn Analysis of the GalaxyoGalaxy has 2 primary components a DISK and a SPHEREo

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Term
Spring
Professor
AlexandriaOakes
Tags
The Milky Way, Globular cluster, spiral arms

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