Star classification

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Across
  1. 6. a sequence of stars on the Hertzsprung–Russell diagram, containing the majority of stars, that runs diagonally from the upper left to the lower right
  2. 7. the angular change per year in the direction of a star as seen from the Sun
  3. 8. a binary star in which the components are not resolved but whose binary nature is indicated by periodic variations in radial velocity, indicating orbital motion
  4. 9. a measure of the amount of light received by Earth from a star or other object—that is, how bright an object appears in the sky, as contrasted with its luminosity
  5. 10. an object intermediate in size between a planet and a star; the approximate mass range is from about 1/100 of the mass of the Sun up to the lower mass limit for self-sustaining nuclear reactions, which is about 1/12 the mass of the Sun
  6. 12. a low-mass star that has exhausted most or all of its nuclear fuel and has collapsed to a very small size; such a star is near its final state of life
  7. 13. an older system of measuring the amount of light we receive from a star or other luminous object; the larger the magnitude, the less radiation we receive from the object
  8. 14. the classification of stars according to their temperatures using the characteristics of their spectra; the types are O, B, A, F, G, K, and M with L, T, and Y added recently for cooler star-like objects that recent survey have revealed
  9. 15. the selection of sample data in a nonrandom way, causing the sample data to be unrepresentative of the entire data set
  10. 16. a star of exaggerated size with a large, extended photosphere
Down
  1. 1. a plot of luminosity against surface temperature (or spectral type) for a group of stars
  2. 2. the rate at which a star or other object emits electromagnetic energy into space; the total power output of an object
  3. 3. a binary star in which the plane of revolution of the two stars is nearly edge-on to our line of sight, so that the light of one star is periodically diminished by the other passing in front of it
  4. 4. motion toward or away from the observer; the component of relative velocity that lies in the line of sight
  5. 5. a binary star in which the two components are telescopically resolved
  6. 11. two stars that revolve about each other