Observations of bright rims in NGC 281, IC 434 and M 16

Details Observations of bright rims in NGC 281, IC 434 and M 16 Observations of bright rims in NGC 281, IC 434 and M 16

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..85..405l&link_type=abstract

Astrophysics and Space Science, vol. 85, no. 1-2, July 1982, p. 405-417. In French.

Astronomy and Astrophysics

Astrophysics

1

Interstellar Gas, H Alpha Line, H I Regions, H Ii Regions, Nitrogen Ions, Oxygen Ions

Scientific paper

Three H II regions, NGC 281, IC 434, and M 16 were photographed monochromatically to obtain H-alpha, N II at gamma = 6584, and O III at gamma = 5007 lines. The survey was taken to study the bright rims created when expanding hot H II regions encounter cooler H I regions. The expanding shock wave, in meeting the cool gas, causes the bright rims to form, which are physically an augmentation of temperature and pressure in gradients from inwards outward. An O III enhancement was detected near the bright rims in M 16 and bright rims in general were most apparent in the N II and O III plates.

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