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MSU AST 207 - HOMEWORK

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AST 207 1. Hpl2. Llu 7 Hot-plate modlotting them oa. (3 pts.absoluChangabsolub. (3 pts.diagraIt woumagnic. (3 pts.place iIt wouthus reMovinLife on Denebuminosity of aa. In clastimes f+2.5 gbetweetwo stalog(fA/distancmA–mratio oBAffDenebAbsolumagnib. The temuch lyou goWe knTherefSolvindel of a star. on a Hertzspr) How can youte magnitudege the hot platute magnitude) If you movem change? uld not, the HRtude or the st) If you turnein the HR diauld move to theddening the sng it down. b. Here you wa star ss we found thfainter has a mgreater. This ren the flux fA ars A and B a/ fB). (3 pts.) ce? (2 pts.) WB= –2.5 log(fAof their fluxes105.2)(BAmmb is 71000 timute magnitudetude, you woumperature of larger is Deneot the values. now fore: 71000ng for the radiHomewImagine thatrung-Russell dou make two he? tes size. For ae or luminosited the hot plaR diagram dears distance fed the setting gram change?he right and dstar and moviwill find out wh, where That a star 10 magnitude elationship and fB of and their magnHow much brWhat quantityfA/ fB), where , we get 105.2)83.43.7(mes as bright ae makes this culd have to acthe sun is 570eb than the su . Use the ra22SunSunDeDenebTRTRii ratio we getwork 5 you have madiagram hot plates witall parts, the ky  aate to a greaterepends on the from us. on the hot pla? own. Doing ing it to the rihat it means tis its temperanitudes can brighter is Deny makes this cmA will be De71000 at the sun. comparison inccount for dis00K, and the tun? (3 pts.) Exatio of the lum244SunDenebnenebRRt: Star ApSun -2Deneb 1.2ade “stars” outh the same spkey idea is thaand temperatur distance, hoabsolute magate from “higthis would firight, and secoto live near a gature and R isbe expressed mneb than the sucomparison ineneb, and mBn the most dirstance. temperature oxplain the prinminosity of De4242)5700()9800(b pp. Mag. A6.74 4.25 -7Due 18 Octoat beginningNo laut of hot platepectral class aat the H-R diaure. ow would its pgnitude, not ogh” to “mediurst, decrease tond, decrease giant like Dens its radius. mathematicallun if both aren the most dirB will be the srect way. If yof Deneb is 98nciple(s) that eneb to that oAbs. mag. Di83 1/27.3 50ober 2010 g of class. ate papers. es and you areand differing agram is a ploplace on the Hon the apparenum,” how wouthe temperatuits luminositneb. Recall thly as mA–mB=e placed at therect manner?un, solving foyou used appa800K. (2 pts.)you use and wof the sun. istance (pc)200,000 00 e ot of HR nt uld its ure, ty. hat the = –2.5 e same or the arent ) How whereAST 207 3. M 7 SunDenebRRDenebTo ansrelatiogiven. c. (2 pts.)our repthe valThe hareplacereplaceThe raM15. Figure 1a. (2 pts.From tb. (3 pts.There hydrogc. Stars waccounTheir sSince tempertempersame. 5 magnof 2.5 factorsluminoSo if luincreas100, anstays cR=10. Therefcoversradius times t71000bb is 90 times tswer this we nnship to the r) The sun subplacement sublues. alf-angle of thed the sun, theement sun is adius was from is the Hertzs) What is the the HR diagra) Why are theare no hotter gen cores andwith a color Bnts for this obsize (or radiucolor is relaterature, the ratures are thenitudes is twomag, which is of 10 in osity, or 102, ouminosity (L)ses by a factond temperaturconstant, then, 100 = Rfore the radius a factor of 1of the giants that of the dwHomew2DenebSunTThe radius of tneeded to knoradius and tembtends ½ degrbtend? (2 pts.he sun is e radius is lar90  0.5° m part b. sprung-Russelabsolute magam, the hottesere no hotter mstars on the md left the main-V=0.6 span abservation? (3s) accounts foed to e o steps is two or 100. ) or of re (T) n using R2, or s 0. The is ten warfs. Figmescawork 5 98057071000the sun. ow the ratio omperature of aee in the sky. .) Explain the/, where ger by a facto45°. ll diagram of gnitude of thest main sequemain-sequencmain sequencn sequence. Ha range of 5 m3 pts.) What isor this range igure 1 Hertzspreasure of color.ale on the right9000002 of luminositiea star. The tem If Deneb repe principle(s) R is its radiuor of 90. Therefthe star cluste hottest mainence stars are ce stars? ce because theHotter stars usmagnitudes. (2s the range ofin observationrung-Russell d. The vertical st is absolute maDue 18 Octoat beginningNo las from part a,mperatures caplaced the sunthat you use aus and D is its efore the anglter M15. n-sequence staabout 3.5 ey all already se up their fu2 pts.) What pf this propertyn. diagram of the sscale on the lefagnitude. ober 2010 g of class. ate papers. , and luminosame from the n, what angle wand where yodistance. If Dle subtended bars? used up theirel faster. property of they? star cluster M1ft is apparent msity’s data would ou got Deneb by the r e stars 15. B-V is a magnitude, and


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MSU AST 207 - HOMEWORK

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