Visions of the Universe
Visions of the Universe ISP 205
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This 1 page Class Notes was uploaded by Ms. Mckenzie Labadie on Saturday September 19, 2015. The Class Notes belongs to ISP 205 at Michigan State University taught by Staff in Fall. Since its upload, it has received 17 views. For similar materials see /class/207732/isp-205-michigan-state-university in Integrative Studies Physical at Michigan State University.
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Date Created: 09/19/15
Hotplate model of stars March 14 Test 2 will be unhidden on Hotplate model of a star loncapamsuedu before end of HertzsprungRussequot Diagram day39 Dwarfs giants amp white dwarfs Public viewing sessions at MSU campus observatory Fri amp Sat 911pm if it is not cloudy Mar18amp19 Apr15amp16 May13amp14 24inch telescope in dome small telescopes outside Same questions 100 on hwk 25 on test How should homework be changed to make it more useful Study guide Write explanation for hwk If wording in unclear on test question ask during test Observed properties of stars Mass 0 Measured in kg or Me 00830 Me Surface temperature 5800K for sun 3000 K for cool star 0 Luminosity is amount of energy the star produces in a second WattsJouless or Le 40000LO for Betelgeuse Flux or apparent brightness is amount of energy received from the star by a detector in a second Depends on distance Composition abundances of elements Orion constellation httplithops as arizona eduNjillEPOPostersOrionprotoplanets html Finding luminosity from ux We measure ux incident on detector on Earth Energy receivedunit time unit area We want to know luminosity Energy produced by starunit time Ql Suppose Betelgeuse is moved closer Sl Its ux increases S2 Its luminosity increases Statements Sl amp S2 are a TT b TF c FT 1 FF Finding luminosity from ux 111 Fig 111 We measure ux incident on detector on Earth 0 Energyunit time unit area We want to know luminosity Energyunit time We need to also know the distance D F L 4 7tD2 For nearby stars use 2 method of parallax Read L 4WD F about parallax in 111
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