Star A

1. 1 Two stars, A & B, have thesame apparent magnitude.Star A is twice as far awayas star B. Which starhas a higher luminosity? Star A

2. 2 Like the Sun, m___ s_____ stars are convertinghydrogen into heliumin their cores. main sequence

3. 3 What is our Sun's classification letter? G, or G2

4. 4 In a ____ system, the more massive star always stays closer to the center of mass and moves slower. binary

5. 5 A star of ten solar masses would stay stable on the main sequence for __ time than our Sun.A) a much longerB) a much shorter C) about the same much shorter

6. 6 Two golf balls separatedby 100 kilometers is areasonable comparison ofthe size and distancerelationship of ourSun and what? Sun’s nearest star

7. 7 If a star is found byobservations to be about30 parsecs distant,its parallax is about ___. .03”

8. 8 If a star appears to move back and forth relative to other stars over a six-month period, this motion is due to the star's ________. parallax shift

9. 9 The great Greek astronomer Hipparchus compiled the first catalog of stars, accurately measured their positions, and defined the basic system of stellar _______. brightnesses(or magnitudes)

10. 10 On Jupiter, 6x further away from the Sun than Earth, the amount of sunlight received per square cm is different by what factor? 36 times less

11. 11 What are the two mostimportant propertiesused to classify stars? luminosity and(surface) temperature

12. 12 Two stars, A & B, both havean apparent magnitude of2.0, but star A is at a distanceof 50 pc and star B is 20 pcdistant. If both stars were atthe same distance away,which star would appearto be brighter? Star A

13. 13 The star's color index isa quick way of determiningits ___________. temperature

14. 14 Star 1 is a main sequence star of spectral type G5; Star 2 is a red giant of spectral type K2; Star 3 is a white dwarf of spectral type B4. Which star is the hottest? Star 3

15. 15 Stars that have masses similar to the Sun's, and sizes similar to the Earth are _______ dwarfs. white

16. 16 On the H-R diagram, the Sun lies ___ of the main sequence. A) to the top left. B) to the top right. C) to the bottom right. D) about the middle D) about the middle

17. 17 Which of the following is the most common type of star? A) high mass main seq B) low mass main seq (Sun) C) white dwarfs D) red giants B) low mass main seq(Sun)

18. 18 The Hertzsprung-Russell Diagram plots ________ against the spectral type or temperature. luminosity or absolute magnitude

19. 19 On the H-R diagram, red supergiants like Betelgeuse lie where? at the top right.

20. 20 In the H-R diagram, the bright blue-white stars that dominate the naked eye sky lie where? ` top left.

21. 21 A majority of stars in the universe occur as a ___________ system. (think number) binary, two star

22. 22 What is the single most important characteristic in determining the course of a star's evolution? mass

23. 23 What is the typical main sequence lifetime of an M-type star? A) ten million years B) one billion years C) ten billion years D) a trillion years D) a trillion years

24. 24 What is the typical main sequence lifetime of a G-type star? A) 10 million years B) 100 million years C) 1 billion years D) 10 billion years D) 10 billion years

25. 25 What is the typical main sequence lifetime of a B-type star? A) 20 million years B) 1 billion years C) 10 billion years D) 100 billion years A) 20 million years

26. 26 Star A: abs mag = 2.5 Star B: app. Mag = 2.5 Star A is on main seq. Star B is a red giant. Which one appears brighter to us on Earth? Impossible todetermine from info

27. Final From hottest to coolest, the seven letters for the star types are________. OBAFGKM