Ch16_Outline - Chapter16 BeyondtheSolar System...

Info icon This preview shows pages 1–12. Sign up to view the full content.

View Full Document Right Arrow Icon
 Chapter 16  Beyond the Solar  System
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
    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 
Image of page 2
    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      
Image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
    Properties of Stars   Stellar brightness    Controlled by three factors Size Temperature Distance Magnitude   Measure of a star's brightness
Image of page 4
    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    
Image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
    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 
Image of page 6
    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
Image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
    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    
Image of page 8
    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     
Image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
    Binary Stars  Orbit Each  Other Around  Their  Common  Center of  Mass Figure 16.4
Image of page 10
    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  
Image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 12
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern