Ring nebulae associated with Wolf-Rayet stars in the Large Magellanic Cloud. II - Kinematics of DEM 45, 137, 165, 174, and 208

Details Ring nebulae associated with Wolf-Rayet stars in the Large Magellanic Cloud. II - Kinematics of DEM 45, 137, 165, 174, and 208 Ring nebulae associated with Wolf-Rayet stars in the Large Magellanic Cloud. II - Kinematics of DEM 45, 137, 165, 174, and 208

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...255...79c&link_type=abstract

Astrophysical Journal, Part 1, vol. 255, Apr. 1, 1982, p. 79-86.

Astronomy and Astrophysics

Astrophysics

8

Hydrogen Ions, Magellanic Clouds, Nebulae, Wolf-Rayet Stars, Amorphous Materials, Fabry-Perot Interferometers, Forbidden Transitions, H Ii Regions, High Resolution

Scientific paper

The velocity fields of five ring nebulae associated with Wolf-Rayet stars in the Large Magellanic Cloud are investigated in order to distinguish among possible origins. Velocities were mapped by the use of the CTIO pressure-scanned Fabry-Perot interferometer at the forbidden O III line, and the high-resolution line profiles obtained were used to determine the dynamical ages of the nebulae. Comparison of ring dynamical ages with the age of the Wolf-Rayet star confirms DEM 174 as an amorphous H II region illuminated by the star. DEM 45 and 165 have internal motion less than 10 km/sec, while DEM 137 and 208 are shells expanding at about 15 to 20 km/sec with dynamical ages of several million years. These last four are structured H II regions, and are 10 to 20 times larger than their Galactic counterparts. It is suggested that the two largest rings, DEM 137 and 208, were formed by stellar associations, while DEM 45 and 165 are part of a molecular cloud-H II region complex.

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