A study of H-alpha velocities in NGC 1499, NGC 7000, and IC 1318B/C

Details A study of H-alpha velocities in NGC 1499, NGC 7000, and IC 1318B/C A study of H-alpha velocities in NGC 1499, NGC 7000, and IC 1318B/C

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...269..164f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 269, June 1, 1983, p. 164-174.

Astronomy and Astrophysics

Astrophysics

20

Astronomical Spectroscopy, Interstellar Gas, Nebulae, Astronomical Models, H Alpha Line, H Ii Regions, Hydrogen Ions, Radial Velocity, Spectrographs, Stellar Winds

Scientific paper

Multiple slit echelle spectrograph observations of the H-alpha emission line are used to map the radial velocities of the California Nebula (NGC 1499), the North American Nebula complex (NGC 7000 and IC 5070), and IC 1318B/C. The California Nebula is singularly constant in velocity, considering its geometry. The North American Nebula complex reflects a very simple, classical dynamical picture. The expansion discovered earlier in IC 1318B/C is confirmed, detailed, and the model refined. The new data, along with that in earlier papers of this series, show that stellar wind acceleration and champagne flow mechanisms both play important roles in determining the evolution of H II regions.

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