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ASTR 1102-002 2008 Fall Semester. Joel E. Tohline, Alumni Professor Office: 247 Nicholson Hall [Slides from Lecture02]. Course Syllabus ( corrected Final Exam time!). Evaluation of Coursework. Corrected final exam time!. Chapter 17: The Nature of Stars. Describe Population (of stars).

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astr 1102 002 2008 fall semester

ASTR 1102-0022008 Fall Semester

Joel E. Tohline, Alumni Professor

Office: 247 Nicholson Hall

[Slides from Lecture02]

evaluation of coursework
Evaluation of Coursework

Corrected final exam time!

slide5

Describe Population (of stars)

  • Location
    • Coordinate position
    • Distance
  • Motion
    • Across the photo/sky
    • Toward/away from us
  • Intrinsic properties
    • Mass
    • Color
    • Brightness
    • Age
slide6

Describe Population (of fans)

  • Location
    • Coordinate position
    • Distance
  • Motion
    • Across the photo/sky
    • Toward/away from us
  • Intrinsic properties
    • Mass (weight)
    • Color (clothes)
    • Brightness (?)
    • Age
slide9
Location – Determine exact location of every fan!
    • Coordinate position (x-y coordinate on photo)
    • Distance (distance from photographic lens)
slide10
Location – Determine exact location of every fan
    • Coordinate position (x-y coordinate on photo) straightforward
    • Distance (distance from photographic lens)
slide11
Location – Determine exact location of every fan
    • Coordinate position (x-y coordinate on photo)
    • Distance (distance from photographic lens) not so straightforward!
slide12

e.g., Google Earth

  • Location – or … using GPS system …
    • Coordinate position (latitude & longitude)
    • Distance (altitude above sea level)
slide15
Location – Determine exact location of every star!
    • Coordinate position (“declination” & “right ascension”)
    • Distance (from Earth)
slide16

Straightforward: Analogous to “latitude” & “longitude”; e.g., Google Sky

Textbook ‘Box 2-1’

pp. 30-31

  • Location – Determine exact location of every star!
    • Coordinate position (“declination” & “right ascension”)
    • Distance (from Earth)
slide18
Location – Determine exact location of every star!
    • Coordinate position (“declination” & “right ascension”)
    • Distance (from Earth) not so straightforward!
determining distances to astronomical objects
Determining Distances to Astronomical Objects
  • Not at all straightforward!
  • Only direct method is “Stellar Parallax”
    • See textbook discussion associated with Figs. 17-1 and 17-2
  • Other indirect methods will be discussed later
individual stars
Individual Stars…
  • Location in Space
    • Coordinate (angular) position on the sky
    • Distance from Earth
  • Motion through Space
    • Motion across the sky (“proper” motion)
    • Motion toward/away from us (radial velocity)
  • Intrinsic properties
    • Brightness (luminosity/magnitude)
    • Color (surface temperature)
    • Mass
    • Age
individual stars1
Individual Stars…
  • Location in Space
    • Coordinate (angular) position on the sky
    • Distance from Earth
  • Motion through Space
    • Motion across the sky (“proper” motion)
    • Motion toward/away from us (radial velocity)
  • Intrinsic properties
    • Brightness (luminosity/magnitude)
    • Color (surface temperature)
    • Mass
    • Age
slide24

Motion

    • Across the photo/sky
    • Toward/away from us
  • Location
    • Coordinate position
    • Distance
slide25

Motion

    • Across the photo/sky
    • Toward/away from us
  • Location
    • Coordinate position
    • Distance
slide26

Motion

    • Across the photo/sky
    • Toward/away from us
  • Location
    • Coordinate position
    • Distance
motion across the sky proper motion
Motion Across the Sky(“proper” motion)

http://www.psi.edu/~esquerdo/jim/astfov.gif

slide29

Motion

    • Across the photo/sky
    • Toward/away from us
  • Location
    • Coordinate position
    • Distance
determining motion of astronomical objects toward away
Determining Motion of Astronomical Objects toward/away
  • Surprisingly straightforward!
  • Doppler effect
    • See textbook discussion in Chapter 5, §5-9
doppler effect 5 9
Doppler Effect (§5-9)
  • The measured frequency (wavelength) of light changes if the light source is moving toward or away from you
    • Light is “blue-shifted” if the object is moving toward you
    • Light is “red-shifted” if the object is moving away from you
  • Direct analogy with the behavior of sound waves
individual stars2
Individual Stars…
  • Location in Space
    • Coordinate (angular) position on the sky
    • Distance from Earth
  • Motion through Space
    • Motion across the sky (“proper” motion)
    • Motion toward/away from us (radial velocity)
  • Intrinsic properties
    • Brightness (luminosity/magnitude)
    • Color (surface temperature)
    • Mass
    • Age
individual stars3
Individual Stars…
  • Location in Space
    • Coordinate (angular) position on the sky
    • Distance from Earth
  • Motion through Space
    • Motion across the sky (“proper” motion)
    • Motion toward/away from us (radial velocity)
  • Intrinsic properties
    • Brightness (luminosity/magnitude)
    • Color (surface temperature)
    • Mass
    • Age