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Chapter 25

Chapter 25. Section 1: Stars. Stars and Galaxies Objectives. Discuss constellations Understand the difference between apparent and absolute magnitudes Describe parallax. Constellations. Observed patterns of stars in the sky 88 Constellations recognized by IAU

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Chapter 25

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  1. Chapter 25 Section 1: Stars

  2. Stars and Galaxies Objectives • Discuss constellations • Understand the difference between apparent and absolute magnitudes • Describe parallax

  3. Constellations • Observed patterns of stars in the sky • 88 Constellations recognized by IAU • Appear to move, but it is Earth in motion • As Earth orbits the sun, we have different views of the stars • Summer/winter constellations • Circumpolar constellations surround the north pole and stay in view all year • Seem to move because of the rotation of Earth about its axis • Time lapse - Circumpolar stars around alertness tower – YouTube • Circumpolar Stars-Northern Autumn Sky - YouTube

  4. Some familiar constellations • Big Dipper (part of constellation Ursa Major) • Orion • Cassiopeia

  5. Star Properties • Magnitude – brightness of stars • Absolute magnitude – measure of the actual amount of light the star gives off • Apparent magnitude – measure of the amount of light received by Earth • Measurement • Parallax—measure of shift in position when object viewed from different positions • Use geometry to determine distance • Closer object has larger parallax • Light year – distance that light travels in one year • 9.5 trillion km • Nearest star Proxima Centauri is 40 trillion km away • 4.2 Light years

  6. Star Properties • Color of a star indicates its temperature • Hot is blue/white • Cold is red/orange

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