The nearest large H II region.
Mostly powered by the O7 star theta 1 Ori C
Light from star has evaporated part of dense molecular cloud.
formed hot ionized cavity that breaks out of near edge of cloud.
hot gas squirts out towards us (Balick Gammon, R.H. & Hjellming, R.M. 1974, PASP, 86, 616)
Structure was studied in detail by Baldwin, Ferland, Martin et al. 1991.
The largest Giant Extragalactic H II Region in the Local Group of galaxies.
Many times larger than Orion
Ionized by over 100 O stars.
Main ionizing cluster is R136
We will study this in detail with the SOAR Telescope.
30 Doradus is the prototype of Giant Extragalactic H II Regions that can be seen at huge distances.
Distant GEHR's can be used to trace early history of star formation and metal enrichment.
Eric Pellegrini (MSU grad student)
Gary Ferland (Univ. of Kentucky)
Margaret Hanson (Univ. of Cincinnati)
Tom Troland (Univ. of Kentucky)
Peter Martin (Toronto)
Bob Rubin (NASA)
Lisa May Walker (MSU REU student, now at U. of Virginia)
Norm Murray (CITA)
Pellegrini, E.W., Baldwin, J.A., Brogan, C.L., Hanson, M.M., Abel, N.P., Ferland, G.J. Nemala, H.B., Shaw G. & Troland, T.H. 2007, ApJ, 658, 1119 A Magnetically-Supported PDR in M17 http://xxx.lanl.gov/abs/astro-ph/0611808
Blagrave, K. P. M.; Martin, P. G.; Rubin, R. H.; Dufour, R. J.; Baldwin, J. A.; Hester, J. J.; Walter, D. K. 2007, ApJ, 655, 299 Deviations from He I Case B Recombination Theory and Extinction Corrections in the Orion Nebula http://xxx.lanl.gov/abs/astro-ph/0610621
Blagrave, K.P.M., Martin, P.G. & Baldwin, J.A. 2006, ApJ, 644, 1006 A Photoionized Herbig-Haro Object in the Orion Nebula http://xxx.lanl.gov/abs/astro-ph/0603167
Rubin, R.H., Martin, P.G., Dufour, R.J., Ferland, G.J., Blagrave, K.P.M., Liu, X.-W., Nguyen, J.F. & Baldwin, J.A. 2003, MNRAS, 340, 362S Temperature Variations from Hubble Space Telescope Spectroscopy of the Orion Nebula" http://xxx.lanl.gov/abs/astro-ph/0212244
Baldwin, J.A., Verner, E.M., Verner, D.A., Ferland, G.J., Martin, P.G., Korista, K.T. & Rubin, R.H. 2000, ApJS, 129, 229 High resolution spectroscopy of faint emission lines in the Orion Nebula ADS Link