Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...155..297c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 155, no. 2, Feb. 1986, p. 297-313.
Astronomy and Astrophysics
Astrophysics
191
Astronomical Photometry, H Ii Regions, Interstellar Extinction, Magellanic Clouds, Astronomical Catalogs, Cosmic Dust, H Alpha Line, H Beta Line, Stellar Color, Ubv Spectra
Scientific paper
Absolute H-alpha and H-beta of H II regions in the Large Magellanic Cloud are used in conjunction with radio continuum, 21-cm line, and stellar UBV data to study the dust associated with these regions. Various hypotheses concerning the optical properties and the spatial distribution of the dust are examined, and the predicted characteristics are compared with the observations. Uniform interstellar extinction cannot explain the data. The following picture which is consistent with the observations is suggested: some of the extinction is due to clumped dust well outside of the emission zone, and the rest is caused by dust located closer to the ionized gas where scattering effects are important. This latter dust probably lies mostly just outside the boundary of the H II region, but some of the dust may be internal.
Caplan James
Deharveng Lise
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