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3. 3 Spectra of different kinds of celestial objects Makemake

4. 4 10/17/11 Spectroscopy Stellar Classification Using Strength of Absorption Lines

5. 5 Spectra in sections looked different because emission tubes contained different elements. Stars have them all. BUT, in general, stars to within a fraction of a percentage, all have similar abundances of the elements!

6. 6 Classification overview: Textbook

7. 7 Understanding atoms He Na Ca Fe

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9. 9 Understanding the guides

10. 10 Qualitative determination of line strength

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13. 13 Identifying 3 lines + assigning element and line strength 41 Cygni data in Excel Google Spreadsheet Google Spreadsheet (see instruction on a handout) 389.1 H8 430.3 “G” band 540.7 He II

14. 14 Calculating a line strength

15. 15 Measuring the strength of 3 lines

16. 16

17. 17 Determining Spectral Type and Surface Temperature 0.38 0.20 F7 6300