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Hertzsprung -Russell Diagrams

Hertzsprung -Russell Diagrams. Questions. Do the nearby or the bright stars provide a more typical example of the star population within the Milky Way Galaxy?

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Hertzsprung -Russell Diagrams

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  1. Hertzsprung-Russell Diagrams

  2. Questions • Do the nearby or the bright stars provide a more typical example of the star population within the Milky Way Galaxy? • Would you expect the same percentage of stars to occupy each branch of the diagram if all stars within the Milky Way Galaxy were plotted?

  3. Questions • What is the relationship between absolute magnitude and stellar classification of main sequence stars? • Does the same relationship hold for stars on the other branches of the H-R diagram? • Is there a different relationship for non-main sequence stars? • Why are there regions where no stars are plotted?

  4. Questions • Will variable stars occupy one or more of the existing branches on the H-R diagram? • Some of the empty regions? • Predict where the pulsating variable stars will be located on the H-R diagram.

  5. Questions • Are the Cepheid, RR Lyrae, Mira and Semiregular variable stars located on the diagram where you expected them to be? • Are they on any of the branches? • Do they occupy empty regions? • Are they within the instability strips?

  6. Questions • Are the Cepheids, RR Lyraes, Miras and Semiregular types all grouped together within their separate regions of instability? • If not, how is it determined what type of variable they are?

  7. Stellar Evolution

  8. Evolutionary Stages of a Massive Star Image # Description: Image # Description:

  9. Evolutionary Stages of a Mid-Sized Star Image # Description: Image # Description:

  10. Evolutionary Stages of a Type I-a Supernova Image # Description: Image # Description:

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