HR Diagram Lab - Answer Sheet - Answer Sheet ASTR 100 Spring 2016 Hertzsprung-Russell Diagram Online Lab Print out this answer sheet and use it to

HR Diagram Lab - Answer Sheet - Answer Sheet ASTR 100...

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Unformatted text preview: Answer Sheet ASTR 100 – Spring 2016 Hertzsprung-Russell Diagram Online Lab • Print out this answer sheet, and use it to record your work for the online lab. • Save a copy of your answer sheet as a pdf file or as jpeg images, and upload your work on Compass2g by clicking on the title Hertzsprung-Russell Diagram Online Lab as it appears under the Online Labs tab. • You may work alone or in a group of two or three people. If you choose to work in a group, make sure that each group member’s name is on this answer sheet. Only one of your group members should submit one answer sheet for the entire group. Name: ______________________________________ NetID: _______________________ Name: ______________________________________ NetID: _______________________ Name: ______________________________________ NetID: _______________________ 1. (12 points) Star Surface Temperature (K) Betelgeuse Spectral Type M2 3500 Arcturus 4,300 Color Orange-red K1 orange 5778 G2 Yellow Procyon A 6530 F5 Yellow-White Sirius A 9940 A1 White Sun Rigel A 11,000 Delta Orionis B8 White O9 30,000 Blue 2. (4 points) Radius (R¤) 1 1 Temperature (T¤) Luminosity (L¤) 1 1 2 16 1 3 1 1/2 9 1/256 HR Diagram Answer Sheet 1/4 Answer Sheet 3. (4 points) Luminosity (L¤) Mass (M¤) 0.5 0.08838834765 10 1.930697729 5 279.5084972 3160 9.997941586 4. (4 points) Description Top Hot stars are found at the: Right Bottom Left X Faint stars are found at the: X Luminous stars are found at the: X Cool stars are found at the: X 5. (4 points) Upper Left Description Large blue stars are found at the: Upper Right Lower Right Lower Left X Small red stars are found at the: X Small blue stars are found at the: Really large red stars are found at the: X X 6. (6 points) Star Surface Temperature (K) Luminosity (L¤) Radius (R¤) Vega 10,000 35 Antares 3,500 65,000 Sirius B 10,000 0.001 Pollux 5,000 35 Zeta Ophiuchi 33,000 65,000 7.9 Gacrux 3,500 1,500 110 2 700 0.011 8 HR Diagram Answer Sheet 2/4 Answer Sheet Antares 7. (4 points) ____________________ Bright and cool. __________________________________________________________________________ Sirius B 8. (4 points) ____________________ mildly Hot and dim. __________________________________________________________________________ Increases. 9. (4 points) ____________________ Antares and Gacrux have same surface temperature, antares has much greater luminosity and also __________________________________________________________________________ much greater radius. __________________________________________________________________________ __________________________________________________________________________ Decreases 10. (4 points) ____________________ Antares and Zeta Ophiuchi have the same luminosity, Antares has greater radius but smaller surface __________________________________________________________________________ temperature. __________________________________________________________________________ __________________________________________________________________________ Increases. 11. (4 points) ____________________ Pollux and Zeta Ophiuchi have same radius, as the luminosity in Zeta is greater, its surface __________________________________________________________________________ temperature is also greater. __________________________________________________________________________ __________________________________________________________________________ 12. (9 points) Surface Temperature (K) 30,000 Luminosity (L¤) Radius (R¤) Color 15000 4.6 Blue 6,000 1.2 1 Cream Coloured 3,000 0.0016 0.15 Orange 13. Large, hot, bright and blue. (4 points) _____________________________________________________________ 14. Small, cool, dim and orange. (4 points) _____________________________________________________________ HR Diagram Answer Sheet 3/4 Answer Sheet 15. (3 points) B a) ________ O b) ________ Sun c) ________ 16. (6 points) Star Surface Temperature (K) Luminosity (L¤) Luminosity Class Vega 10,000 35 Antares 3,500 65,000 Supergiants Sirius B 10,000 0.001 White Dwarf Pollux 5,000 35 Giants Zeta Ophiuchi 33,000 65,000 Dwarfs Gacrux 3,500 1,500 Giants Dwarfs 17. (8 points) Group Temperature (hot/cool) Luminosity (bright/dim) Size (large/small) Color (red/blue) Nearest Stars Cool Dim Small Red Brightest Stars Hot Bright Large Blue Only a few of them. 18. (2 points) ______________________________________________________________ Student C would be correct, the brightness we see is based on the stars luminosity and 19. (5 points) ______________________________________________________________ the distance the star is away from us. Hence, both luminosity and distance together play a part in __________________________________________________________________________ our perceived brightness rather than just one of these factors. __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ I would say the sun could be used as an ‘average star’. It really depends on the sample 20. (5 points) ______________________________________________________________ of stars that you are examining. Neither nearby or bright stars would be a better representation for an ‘average’ star. __________________________________________________________________________ Somewhere between them is where I would say you could represent an ‘average star’. __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ HR Diagram Answer Sheet 4/4 ...
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  • Fall '09
  • KLINGER
  • Astronomy, Sirius, Stellar classification, HR Diagram Answer

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