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  • 1. 25.1 Properties of Stars<br />
  • 2. Vocabulary<br />
  • 3. Constellation<br />An apparent group of stars originally named for mythical characters. <br />The sky is divided into 88 constellations.<br />
  • 4. Binary star<br />One of two stars revolving around a common center of mass under their mutual gravitational attraction.<br />
  • 5. Light-year<br />The distance light travels in a year, about 9.5 trillion kilometers.<br />
  • 6. Apparent Magnitude<br />The brightness of a star when viewed from Earth.<br />
  • 7. Absolute Magnitude<br />The apparent brightness of a star if it were viewed from a distance of 32.6 light-years.<br />
  • 8. Main-sequence star<br />A star that falls into the main sequence category on the H-R diagram.<br />
  • 9. Red Giant<br />A large, cool star of high luminosity.<br />
  • 10. Supergiant<br />A very large, very bright red giant star.<br />
  • 11. Cepheid Variable<br />A star whose brightness varies periodically because it expands and contrasts. <br />
  • 12. Nova<br />A star that explosively increases in brightness.<br />
  • 13. Nebulae<br />A cloud of gas and/or dust in space. <br />
  • 14. Key Concepts<br />
  • 15. Color is a clue to a star’s temperature.<br />
  • 16. Binary stars are used to determine the star property most difficult to calculate- its mass.<br />
  • 17. The nearest stars have the largest parallax angles, while those of distant stars are too small to measure.<br />
  • 18. Three factors control the apparent brightness of a star as seen from Earth: how big it is, how hot it is, and how far away it is.<br />
  • 19. A Hertzsprung Russell diagram shows the relationship between the absolute magnitude and temperature of stars.<br />

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