Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21348503b&link_type=abstract
American Astronomical Society, AAS Meeting #213, #485.03; Bulletin of the American Astronomical Society, Vol. 41, p.455
Astronomy and Astrophysics
Astronomy
Scientific paper
We use HST, FUSE, and IUE spectra, and the observed interstellar absorption of highly ionized species, C IV, Si IV, and N II to probe the nebular ejecta and evolution of the well-defined interstellar Bubble-H II regions about the O star HD 148937 and the hot stars of the Rosette Nebula. These ionized species require ionization greater than 13.6 eV and originate within the H II regions representing the encompassing nebulosities. In both bubble - H II regions, we deduce exceptionally young ages for both central cavities. For HD 148937, where we identify at least seven distinct velocity components, all formed in the H II region or ionized condensations associated with the star. The inner cavity is extremely young, only 30,000 years, far younger than the estimated 5 Myr stellar age of the star. For the cavity containing the bright young OB stars of NGC 2244( 2-4 Myr) both the radius and expansion velocity of the 6.2 pc inner shell also yield a very young age, tage 64,000 years. These combined results represent a strong contradiction to theory and present modeling, where much larger bubbles are predicted around individual O stars and O-associations. The small dimensions of the bubbles and their deduced ages extend the "missing wind luminosity problem" to young evolving bubbles. These combined results indicate that OB star winds initially do not form hot, adiabatically expanding cavities, but stir the surrounding H II regions where kinetic energy is converted to turbulence and radiated away. Actual cavities (interstellar bubbles) appear only to form at later times, perhaps triggered by increased mass loss rates or discrete ejection events. Decreased mass loss rates for O stars do not rectify this problem.
Bruhweiler Frederick C.
Freire-Ferrero Rubens
Gull Ted
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