1. WHERE IS FLUORINE? By: Ann Dyer, Samantha Sullivan, and Isaac Richter

2. About Fluorine The most reactive element on the periodic table. Explodes with hydrogen. Only one stable isotope: F-19 Used for etching glass and atomic bombs (UF6)

3. Wolf-Rayet Stars 1 st spectral line studies by G. Rayet & C. Wolf Hot, bright, and large (~20 solar masses) Form from massive O- type MS stars Strange composition: more He than H Super gigantic winds! Mass loss

4. N III C IV He I

5. Main Sequence Stars Fusion: hydrogen to helium Produce fantastic energy Energy released during fusion pushes on stellar material (radiation pressure) and balances gravity Stars spend 90% of lifetime as a MS star The more massive a star is, the less time it spends as a MS star Stars with mass <.08 solar masses never become MS stars (brown dwarf stars)

6. H I He I

7. So, where's the fluorine? Wolf-Rayet vs. Main Sequence Very turbulent Monster stellar winds! Lower than normal hydrogen levels Short lifespan Very rare Stable Holy hydrogen! 90% of lifetime spent as a main sequence star Numerous

8. Fluorine 7037

9. Why there, fluorine? Fluorine can exist in Wolf-Rayet stars because it is ejected so quickly in the winds that it can escape the other elements.