Survey of the Stars

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Across
  1. 5. A cluster of up to several thousand stars, found only in the disks of galaxies and often contain young stars
  2. 8. Stars that appear just below the supergiants on the H-R diagram because they are somewhat smaller in radius and lower in luminosity
  3. 9. A system for describing stellar brightness by using numbers
  4. 10. A measure of the apparent brightness of an object in the sky, based on the ancient system developed by Hipparchus
  5. 14. The length of time for which a star of a particular mass can shine by fusing hydrogen into helium in its core
  6. 16. A measure of an object's luminosity; defined to be the apparent magnitude the object would have if it were located exactly 10 parsecs away
  7. 17. The hot, compact corpses of low-mass stars, typically with a mass similar to that of the Sun compressed to a volume the size of Earth
  8. 18. The total power output of an object, usually measured in watts or in units of solar luminosities
  9. 19. Stars whose temperature and luminosity place them on the main sequence of the H-R diagram
  10. 20. The point on a cluster's H-R diagram where its stars turn off from the main sequence; the age of the cluster is equal to the main-sequence lifetime of stars at the main-sequence turnoff point
Down
  1. 1. A star system that contains two stars
  2. 2. A binary star system in which both stars can be resolved through a telescope
  3. 3. A spherically shaped cluster of up to a million or more stars; found primarily in the halos of galaxies and contain only very old stars
  4. 4. A way of classifying a star by the lines that appear in its spectrum
  5. 6. The distance to an object with a parallax angle of 1 arcsecond; approximately equal to 3.26 light-years
  6. 7. A binary star system in which the two stars happen to be orbiting in the plane of our line of sight, so that each star will periodically eclipse the other
  7. 11. The amount of light reaching us per unit area from a luminous object
  8. 12. Stars that grow alternately brighter and dimmer as their outer layers expand and contract in size
  9. 13. A star that is between being a main-sequence star and being a giant; subgiants have inert helium cores and hydrogen-fusing shells
  10. 15. A binary star system whose binary nature is revealed because we detect the spectral lines of one or both stars alternately becoming blueshifted and redshifted as the stars orbit each other