Superbubble DEM 301: A Radiation-Bounded Nebula Leaking Ionizing Photons

Details Superbubble DEM 301: A Radiation-Bounded Nebula Leaking Ionizing Photons Superbubble DEM 301: A Radiation-Bounded Nebula Leaking Ionizing Photons

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.7206o&link_type=abstract

American Astronomical Society, 194th AAS Meeting, #72.06; Bulletin of the American Astronomical Society, Vol. 31, p.948

Astronomy and Astrophysics

Astronomy

Scientific paper

DEM 301 (N70) in the Large Magellanic Cloud is a well-known superbubble presumably created by the stellar winds and supernovae of the enclosed OB association LH 114. The dominant stars presently found in this association are of spectral type O3 If* and O5: III. The photometry for these stars implies ionizing luminosities log L_LyC ~ 39.2, yet the observed Hα emission from the nebula implies only log L_LyC = 38.0. It would therefore seem likely that the nebula should be density-bounded. However, here we present emission-line spectra and photoionization models of DEM 301 that show this object to be primarily radiation-bounded. We present narrow-band images of the object and discuss how the nebula can leak the majority of its ionizing photons but still be radiation-bounded. We note that signatures of density-bounded nebulae are therefore not required evidence of existing photon leakage.

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