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Understanding the Significance of Cepheid Variables in Stellar Spectroscopy

Learn about Cepheid variables and their periodic brightness variations. Explore the Period-Luminosity Relation and the application of spectroscopy in understanding stellar properties.

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Understanding the Significance of Cepheid Variables in Stellar Spectroscopy

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  1. Lecture 15, Oct. 1…An illustration of ideas, m,M, etcCepheid Variables Cepheid variables show periodic variations in brightness, up to a magnitude or so. See p454 of book

  2. The prototype….Delta Cephei Iota (3.52) delta Epsilon (4.19) Zeta (3.35) Lambda(5.04)

  3. The Importance of Cepheids…the Period-Luminosity Relation

  4. Starlight…application of spectroscopy to stars • Continuous spectrum gives surface temperature (Wien’s Law) • Spectral lines give chemical composition, temperature (also), speed of rotation (How?) and other properties • Examples of stellar spectra…what can we say?

  5. Spectral classes of stars: O,B,A,F,G,K,M What can you say about the temperatures of these stars?

  6. With information provided by spectroscopy, we can search for correlations between stellar properties

  7. What the data show: the Hertzsprung-Russell Diagram Highest quality data from the Hipparchus spacecraft

  8. 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?

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