The expansive motions around the central hole of the complex giant filamentary shell DEM 34 (N 11) in the Large Magellanic Cloud

Details The expansive motions around the central hole of the complex giant filamentary shell DEM 34 (N 11) in the Large Magellanic Cloud The expansive motions around the central hole of the complex giant filamentary shell DEM 34 (N 11) in the Large Magellanic Cloud

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...225..497m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 225, no. 2, Nov. 1989, p. 497-506.

Astronomy and Astrophysics

Astronomy

31

Galactic Structure, H Ii Regions, Interstellar Matter, Magellanic Clouds, Absorption Spectra, Astronomical Models, Infrared Astronomy Satellite, Interstellar Gas, Ionized Gases

Scientific paper

DEM 34 (N 11) is a 350-pc-diameter giant interstellar shell which has an OB association in its central hole and OB associations within H II regions in its irregular filamentary perimeter. Spatially resolved profiles of the H-alpha emission line have been obtained with the Manchester echelle spectrometer on the Anglo-Australian telescope along a 232-pc-long NS line of measurements which passes over the center of DEM 34. In the faint emission over the central hole of DEM 34 which contains the OB association LH 9, up to 5 separate velocity components within a range of heliocentric radial velocities of 210-370 km/sec are found. Some evidence of systematic radial expansions within the ionized gas of this hole are found; however, expansions more complex than for a single radially expanding spherical shell are indicated.

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