Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.294..422y&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 294, p. 422
Astronomy and Astrophysics
Astronomy
3
Magellanic Clouds, H Ii Regions, Cosmic Dust, Supernova Remnants, Radio Spectra, Balmer Series, Continuous Spectra, Milky Way Galaxy, H I Regions, Radiant Flux Density
Scientific paper
The extinction properties of H II regions in the Large Magellanic Cloud are investigated using radio continuum data obtained from the Molonglo Observatory Synthesis Telescope, digitized and calibrated H-alpha data, and published Balmer decrement measurements. The resulting extinction-color excess diagram suggests that (1) most H II regions in the Magellanic Clouds have similar extinction properties to the Galactic ones, (2) all imaginable gas/dust configurations are possible, and (3) the extinction of some highly reddened H II region cores originates externally in cocoon shells. The puzzle of different extinction-color excess ratios of Galactic and extragalactic H II regions is explained as being due to the different populations of observed samples rather than any intrinsic differences. The extinction of the observed Galactic H II regions produced by foreground dust overwhelms the internal extinction, while the situation in the observed extragalactic H II regions is just the opposite.
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