Monochromatic photographs of giant H II regions in the Magellanic Clouds

Details Monochromatic photographs of giant H II regions in the Magellanic Clouds Monochromatic photographs of giant H II regions in the Magellanic Clouds

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..46..371c&link_type=abstract

Astrophysics and Space Science, vol. 46, Feb. 1977, p. 371-378.

Astronomy and Astrophysics

Astrophysics

14

Astronomical Photography, H Ii Regions, Magellanic Clouds, Monochromatic Radiation, Abundance, Astronomical Spectroscopy, Chemical Composition, Hydrogen Ions, Red Shift

Scientific paper

Narrow band-pass direct photographs have been secured of the central region of 30 Doradus and of several other nebulosities in the Magellanic Clouds. We have utilized an image tube camera attached to the Yale one-meter telescope at the Cerro Tololo Interamerican Observatory. Interference filters whose band passes were selected to allow for the radial velocities of the Magellanic Clouds have been utilized to record monochromatic images of [N ii] )6584, Hx, He i A5876, and [0 ml )~5OO7. In 30 Doradus the main filamentary structures appear to be very similar in H~x, He i, [N ii], and [0 iii], at least in the inner regions where most spectroscopic measurements have been made. The features appear to be material bounded rather than radiation bounded and the excitation differences are very small. Likewise, in NGC 346 in the Small Magellanic Cloud the [0 iii] and H~x images are very similar, but in N44 in the Large Magellanic Cloud excitation differences do appear. The implica- tions of these observations for chemical compositions of nebulosities in the Magellanic Clouds would appear to be that spectroscopic and scanner studies should be supplemented by monochromatic photographs. Some nebulosities can be handled by simple models while for others excitation differences must be taken into account

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