COMPOSITION OF THE ORION NEBULA

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Collisionally excited lines • “Forbidden” lines – Transitions produce lines not observed in the lab; very unlikely under normal conditions – Observed in low-‐density gases where atomic collisions are infrequent, like H II regions! – Notated by square brackets: O++ [O III] • Measure the intensities of these lines to learn about conditions in the nebula

Page 1 and 2: Kathryn Powell & Dr. Reginald Dufou
Page 3: • Clouds of ionized gas • Regio
Page 7 and 8: € reddening-‐ corrected flux
Page 9 and 10: Temperature and Density Calculation
Page 11 and 12: Elemental Abundances log(X/H) + 12

COMPOSITION OF THE ORION NEBULA

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