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25 1 25 1 Presentation Transcript

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