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Lecture 14What spectroscopy tells us about the nature of the stars

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A beautiful example of Kirchoff's Laws. But first, an illustration of how m (apparent magnitude), M ... Epsilon (4.19) Zeta (3.35) Lambda(5.04) Iota (3.52) ... – PowerPoint PPT presentation

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Title: Lecture 14What spectroscopy tells us about the nature of the stars


1
Lecture 14What spectroscopy tells us about the
nature of the stars
The Solar Spectrum
A beautiful example of Kirchoffs Laws
2
(No Transcript)
3
But first, an illustration of how m (apparent
magnitude), M (absolute magnitude) , and the
relation to distance can tell us something
interesting in astronomy Cepheid variables
4
The prototype.Delta Cephei
Iota (3.52)
delta
Epsilon (4.19) Zeta (3.35) Lambda(5.04)
5
The Importance of Cepheidsthe Period-Luminosity
Relation
6
Starlightapplication of spectroscopy to stars
  • Continuous spectrum gives surface temperature
    (Wiens Law)
  • Spectral lines give chemical composition,
    temperature (also), speed of rotation (How?) and
    other properties
  • Examples of stellar spectrawhat can we say?

7
Spectral classes of stars O,B,A,F,G,K,M
What can you say about the temperatures of these
stars?
8
With information provided by spectroscopy, we can
search for correlations between stellar properties
9
What the data show the Hertzsprung-Russell
Diagram
  • Highest quality data from the Hipparchus
    spacecraft

10
The Hertzsprung-Russell Diagram and the Types of
Stars
  • See Figure 16.20
  • Types of stars, important terms
  • Main Sequence
  • Giants
  • Supergiants
  • White dwarfs

What does it all mean?
11
Hertzsprung-Russell Diagram
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