WORKSHEET 1 From blackbody curves pictured in the write up find the peak of emission in Angstroms Then use Wien s law and your wavelength to determine the temperature in Kelvin of each star Wavelength of Peak Emission For Black Body 1 3000 Temperature 9659 Wavelength of Peak Emission For Black Body 2 9000 Temperature 3220 Wavelength of Peak Emission For Black Body 3 5000 Temperature 5796 WORKSHEET 2 Full instructions in Color Index write up Star Name Designation Distance in LY Absolute Magnitude B V 1 Xi Bootis Boo 21 85 5 54 73 2 Tau Ceti Cet 11 91 5 69 0 72 3 Tabit 3 Ori 26 32 3 65 0 46 4 Epsilon Indi Ind 11 81 6 89 1 056 5 Fomalhaut PsA 25 13 1 72 0 09 6 82 Eridani 82 Eri 19 71 5 34 0 71 7 Zeta Tucanae Tuc 28 01 4 67 0 58 8 GX Andromedae GX And 11 70 10 3 1 56 9 Gliese 105 HIP12114 23 42 6 49 0 97 10 36 Ophiuchi 36 Oph 19 52 5 08 0 86 11 Rigil Kent 1 Cen 4 39 4 38 0 71 12 Chi Draconis Dra 26 28 4 04 0 49 13 Sirius CMa 8 60 1 42 0 00 14 Altair Aql 16 73 2 22 0 22 15 Keid 2 Eri 16 26 11 01 0 03 16 Alpha Centauri B 2 Cen 4 39 5 71 0 88 17 Vega Lyr 25 04 0 582 0 00 18 61 Cygni A 61 Cyg A 11 41 7 506 1 14 19 61 Cygni B 61 Cyg B 11 37 8 228 1 32 WORKSHEET 3 Plot a color magnitude diagram from the data table 3 700 3 900 4 000 4 200 4 400 4 700 4 900 5 200 5 500 5 900 6 300 6 800 7 300 8 000 8 700 9 800 11 000 17 000 3 30 000 Color vs Absolute Magnitude 2 1 0 Absolute Visual Magnitude Mv 1 2 3 4 5 6 7 8 9 10 11 12 0 3 0 2 0 1 0 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 Color Index B V WORKSHEET 4 Postlab Questions Answer each of the following questions using your data table graph and knowledge of astronomy 1 MV measures a star s Apparent Magnitude 2 B V is linked to a star s Color Index 3 The coolest nearby star Gx Andromedae 4 Hottest nearby star Vega 5 Temperature of the hottest star in Kelvin 9 800 6 Temperature of the coolest star in Kelvin 3 600 7 Names of the most luminous nearby star and least luminous star 8 Luminosity difference between the above two stars 9 Temperature of the most luminous star 10 Explain coherently what that trend you see in your graphed data 11 What is the Sun s color 12 What is the Sun s absolute magnitude according to the graph 13 What is the absolute value of the very distant star 14 What can you reasonably determine about a star from its color index appearance alone