Contributors Dylan Beck DATASHEET 1 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 1 1 What is Rigil Kent s color and absolute magnitude as determined from the color magnitude diagram Color is Yellow to Yellowish Green absolute magnitude of 4 80 2 What should Rigil Kent s absolute magnitude be according to the magnitude distance equation Are the values close to one another 4 66 yes they are 3 What should Sirius B s absolute magnitude be according to the color magnitude diagram 0 0 4 According to the magnitude distance equation what should Sirius B s absolute magnitude be 2 85 5 Are these two in absolute magnitudes in agreement with one another Not at all hope I didn t do something wrong 6 What two physical characteristics of a star set that star s luminosity Size and Temperature 7 Armed with your knowledge about the source of a star s luminosity from the question above what could be at the root of Sirius B s luminosity issue What must be true about Sirius B assuming that the distance and magnitude have been properly reckoned I think the issue with Sirius B s luminosity is the fact that it s light is being drowned out by Sirius A s light but this must mean that it is smaller and cooler than Sirius A if A is able to drown out some of B s light WORKSHEET 2 Stars of the Pleiades Cluster Name PL 101 PL 202 PL 57 PL 61 PL 192 PL 200 B 7 01 5 28 9 95 13 198 4 12 8 95 V 6 88 5 36 9 45 12 31 4 33 8 59 B V 0 13 0 8 0 5 0 888 0 21 0 36 Absolute Magnitude 1 2 0 2 0 7 6 6 1 3 2 8 Average distance to the Pleiades Distance in pc 6 11 7 59 9 12 72 16 52 3 25 7 22 Stars of the Hyades Cluster Name Hy 7 Hy 32 Hy 116 Hy 97 B 3 92 6 82 13 605 4 695 V 3 88 6 43 12 37 4 55 B V 0 04 0 39 1 24 0 15 Absolute Magnitude 0 5 3 0 9 2 1 3 Average distance to the Hyades Distance in pc 8 09 3 01 0 26 0 77 3 03 WORKSHEET 3 8 What should Epsilon Tauri s absolute magnitude be according to the color magnitude diagram 7 5 9 With this absolute magnitude what is Epsilon Tauri s luminosity compared to the Sun 8 5 10 What is Epsilon Tauri s magnitude according to the magnitude distance equation 6 12 11 Using the absolute magnitude from 10 what is Epsilon Tauri s luminosity compared to the Sun 30 12 How much discrepancy is there between the color magnitude M V and the magnitude distance equation MV 0 82x Luminosity 13 Considering the answer to question 6 what could be at the heart of Epsilon Tauri s luminosity How would you describe the star I think what is at the heart of Epsilon Tauri s luminosity is its size certainly more so than its temperature I would describe it as an Orange Giant star