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LECTURE 16, OCTOBER 26, 2010

LECTURE 16, OCTOBER 26, 2010. ASTR 101, SECTION 3 INSTRUCTOR, JACK BRANDT jcbrandt@unm.edu. Question 4. a) true motion in space. b) apparent shift as we view from opposite sides of Earth’s orbit every six months. c) annual apparent motion across the sky.

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LECTURE 16, OCTOBER 26, 2010

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  1. LECTURE 16, OCTOBER 26, 2010 ASTR 101, SECTION 3 INSTRUCTOR, JACK BRANDT jcbrandt@unm.edu ASTR 101-3, FALL 2010

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  7. Question 4 a) true motion in space. b) apparent shift as we view from opposite sides of Earth’s orbit every six months. c) annual apparent motion across the sky. d) motion toward or away from us, revealed by Doppler shifts. e) orbital motion around the galaxy. A star’s proper motion is its ASTR 101-3, FALL 2010

  8. Question 4 a) true motion in space. b) apparent shift as we view from opposite sides of Earth’s orbit every six months. c) annual apparent motion across the sky. d) motion toward or away from us, revealed by Doppler shifts. e) orbital motion around the galaxy. A star’s proper motion is its A star’s “real space motion” combines its apparent propermotion with its radial motion toward or away from Earth. ASTR 101-3, FALL 2010

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  12. Question 8 Which of the following quantities do you need in order to calculate a star’s luminosity? a) apparent brightness (flux) b) Doppler shift of spectral lines c) color of the star d) distance to the star e) a and d ASTR 101-3, FALL 2010

  13. Question 8 Which of the following quantities do you need in order to calculate a star’s luminosity? a) apparent brightness (flux) b) Doppler shift of spectral lines c) color of the star d) distance to the star e) a and d ASTR 101-3, FALL 2010

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  15. Question 5 In the stellar magnitude system invented by Hipparchus, a smaller magnitude indicates a _____ star. a) brighter b) hotter c) cooler d) fainter e) more distant ASTR 101-3, FALL 2010

  16. Question 5 In the stellar magnitude system invented by Hipparchus, a smaller magnitude indicates a _____ star. a) brighter b) hotter c) cooler d) fainter e) more distant ASTR 101-3, FALL 2010

  17. Question 7 a) one million km. b) one Astronomical Unit. c) one light-year. d) ten parsecs. e) ten light-years. The absolute magnitude of a star is its brightness as seen from a distance of ASTR 101-3, FALL 2010

  18. Question 7 a) one million km. b) one Astronomical Unit. c) one light-year. d) ten parsecs. e) ten light-years. The absolute magnitude of a star is its brightness as seen from a distance of Astronomers use a distance of 10 parsecs (about 32 light-years) as a standard for specifying and comparing the brightnesses of stars. ASTR 101-3, FALL 2010

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  24. Question 12 a) O b) A c) F d) G e) M Which spectral classification type corresponds to a star like the Sun? ASTR 101-3, FALL 2010

  25. Question 12 a) O b) A c) F d) G e) M Which spectral classification type corresponds to a star like the Sun? The OBAFGKM classification scheme is based on absorption lines. ASTR 101-3, FALL 2010

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  33. Question 9 What are the two most important intrinsic properties for classifying stars? a) distance and surface temperature b) luminosity and surface temperature c) distance and luminosity d) mass and age e) distance and color ASTR 101-3, FALL 2010

  34. Question 9 What are the two most important intrinsic properties for classifying stars? a) distance and surface temperature b) luminosity and surface temperature c) distance and luminosity d) mass and age e) distance and color The H–R diagram plots stars based on their luminosities and surface temperatures. ASTR 101-3, FALL 2010

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  43. Question 15 a) ages of stars. b) absolute luminosities of stars. c) masses of stars. d) distances to stars. e) rotation rates of stars. Eclipsing binary stars are very useful for determining the ASTR 101-3, FALL 2010

  44. Question 15 a) ages of stars. b) absolute luminosities of stars. c) masses of stars. d) distances to stars. e) rotation rates of stars. Eclipsing binary stars are very useful for determining the Analysis of the lightcurve of an eclipsing binary star system can reveal the masses of the stars. ASTR 101-3, FALL 2010

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