Ch16_Outline - Chapter16 BeyondtheSolar System...

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 Chapter 16  Beyond the Solar  System
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    Properties of Stars  Distance   Measuring a star's distance can be very  difficult Stellar parallax   Used for measuring distance to a star Apparent shift in a star's position due to the  orbital motion of Earth Measured as an angle Nearby stars have the largest parallax Largest parallax is less than one second of  arc 
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    Properties of Stars   Distance   Distances to the stars are very large Units of measurement Kilometers or astronomical units are too  cumbersome to use Light-year   is used most often Distance that light travels in 1 year One light-year is 9.5 trillion km (5.8  trillion miles) Other methods for measuring distance  are also used      
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    Properties of Stars   Stellar brightness    Controlled by three factors Size Temperature Distance Magnitude   Measure of a star's brightness
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    Properties of Stars  Stellar brightness    Magnitude   Two types of measurement   Apparent magnitude  Brightness when a star is viewed  from Earth Decreases with distance Numbers are used to designate  magnitudes—Dim stars have large  numbers and negative numbers are  also used    
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    Properties of Stars  Stellar brightness    Magnitude   Two types of measurement  Absolute magnitude  "True" or intrinsic brightness of a star Brightness at a standard distance of  32.6 light-years Most stars' absolute magnitudes are  between –5 and +15 
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    Properties of Stars  Color and temperature   Hot star   Temperature above 30,000 K Emits short-wavelength light Appears blue   Cool star   Temperature less than 3000 K Emits longer-wavelength light Appears red
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    Properties of Stars Color and temperature  Between 5000 and 6000 K Stars appear yellow Binary stars and stellar mass   Binary stars   Two stars orbiting one another  Stars are held together by mutual  gravitation Both orbit around a common center of  mass    
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    Properties of Stars Binary stars and stellar mass  Binary stars  Visual binaries are resolved telescopically More than 50% of the stars in the universe  are binary stars Used to determine stellar mass Stellar mass Determined using binary stars—The center  of mass is closest to the most massive star     
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    Binary Stars  Orbit Each  Other Around  Their  Common  Center of  Mass Figure 16.4
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    Properties of Stars Binary stars and stellar mass   Stellar mass Mass of most stars is between one-tenth  and fifty times the mass of the Sun  
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This note was uploaded on 09/14/2011 for the course EAS 120 taught by Professor Svec during the Fall '08 term at Moraine Valley Community College.

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Ch16_Outline - Chapter16 BeyondtheSolar System...

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