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