Ch23_Lecture - Today's Epitome Roll Questions on the labs...

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05/06/09 GEOL1401/tob 1 Today’s Epitome Roll Questions on the labs? Review Chapter 22 –  Touring Our Solar Systems Describe the general characteristics of the two groups of planets in the  solar system. Describe the major features of the lunar surface and discuss the  Moon's history. List the distinguishing features of each planet in the solar system. List and describe the minor members of the solar system. Lecture on Ch 23 – “Light, Astronomical Observations and the  Sun” Next Time Grade the Prof day Paper Labs  Exam comments
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05/06/09 GEOL1401/tob 2 GEOL 1401 – Chapter 23 Light, Astronomical  Observations, and  the Sun Dr. Thomas O. Bush Roberts 116 [email protected] 214-333-5318
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05/06/09 GEOL1401/tob 3 We study light from the stars To find out  what the stars are made of How old they are How fast they are moving How far away they are Light is Electromagnetic radiation  Travels at 300,000 kilometers (186,000 miles) per second  Visible light is only one small part of a spectrum of EM radiation Electromagnetic radiation includes Gamma rays – very energetic X-rays Ultraviolet light Visible light – only what our eye senses  a very small part of the spectrum Infrared light Radio waves – least energetic 
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05/06/09 GEOL1401/tob 4 Spectroscopy is the tool The study of EM radiation that depend on its wavelength Light pattern produced by passing light through a prism Spreads out the various wavelengths  called a spectrum
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05/06/09 GEOL1401/tob 5 Types of spectra   Continuous spectrum   Produced by an incandescent solid, liquid, or high pressure gas Uninterrupted band of color  Dark-line (absorption) spectrum  Produced when white light is passed through a comparatively  cool, low pressure gas Continuous spectrum with dark lines running through it  Most stars have a dark-line spectrum Bright-line (emission) spectrum  Produced by a hot (incandescent) gas under low pressure Appears as a series of bright lines of particular wavelengths  depending on the gas that produced them 
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05/06/09 GEOL1401/tob 6 Formation of the three  types of spectra Instrument used to spread out the light is called a  spectroscope 
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05/06/09 GEOL1401/tob 7 Temperature of a Star As temperature increases Total amount of energy emitted increases Stefan - Boltzmann Law  E ~ T 4 Larger amount radiated at shorter wavelengths Long wavelength is red Short wavelength is blue Is a blue star or a red star the hottest?
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