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5 Written questions

5 Matching questions

  1. Spectral type A
  2. Cataclysmic Variables
  3. Parsec
  4. Magnitude System
  5. Luminosity
  1. a Originated by Hipparchus. A scale to show how bright the stars appear to our eyes (or binoculars and telescopes)
  2. b The distance to an object with a parallax angle of 1 arcsecond; unit is pc. One pc = 3.26 light years (ly) = 3.09 x 10^13 km.
  3. c One of the major classes of variables.
  4. d Aqua - Temperature range: 7,500 - 10,000 K
  5. e A Star's total amount of power radiated into space; measured in watts

5 Multiple choice questions

  1. Two stars that are so close that the only way we can detect the binary nature is through a spectral (red) shift.
  2. Next closest star after the Sun. Part of the three-star Alpha Centauri system. 4.3 light years away. (50 mile high stack of toilet paper stretched out 1 sheet = 1 million miles scale. Parallax angle of 0.77 arcsecond. From the Sun, 1.3 pc or 4.3 ly away or 3.98 x 10^13 km (2.43 x 10^13 miles). Largest Parallax angle we see.
  3. The apparent shift of an object relative to some distant background as the observer's point of view changes. Allows you to determine close stellar distances. Only works with fairly close stars
  4. One of the two major classes of variables. There are five classes. One important example: Cepheid Variables.
  5. The most important stellar property. Measured by an adaptation of Kepler's 3rd Law as derived by Sir Isaac Newton. Kepler's 3rd law you measure the period and average distance of the object's orbit. You need two objects. Over 50% of stars have a companion star.

5 True/False questions

  1. Globular Clusters:Gravitationally-bound grouping of very old stars. <10,000 to one million stars> Old, many, many, stars, organized.


  2. Cepheid VariablesOne of the two major classes of variables. There are five classes. One important example: Cepheid Variables.


  3. Spectral TypeStars color/surface temperature E - this is how we classify stars.


  4. Spectral type KOrange - Temperature range: 3,500 - 5,000 K.


  5. Solar LuminosityComparing a star's luminosity to our Sun's luminosity. Lsun = 3.8 x 10 ^26 watts.