Observations of 85-alpha recombination lines from M16

Details Observations of 85-alpha recombination lines from M16 Observations of 85-alpha recombination lines from M16

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84...77h&link_type=abstract

Astronomical Journal, vol. 84, Jan. 1979, p. 77-85.

Other

3

Astronomical Spectroscopy, Hydrogen Recombinations, Line Spectra, Nebulae, Radiative Recombination, Continuous Spectra, Electron Energy, H Alpha Line, Helium, O Stars, Radial Velocity, Spectral Line Width

Scientific paper

Hydrogen and helium recombination-line observations have been made at eight positions in M16. These observations are compatible with a two-component model of the ionized gas, one component being an extended low-excitation region, the other being a higher-excitation region (with the helium ionized) at a radial velocity about 10 km/s greater than the mean velocity of the first component. The observed radial-velocity variations in the first component appear to be related to streaming motions from ionization fronts. The helium line emission is at a velocity comparable to that of the hottest exciting stars. The continuum radio emission is very low considering the number of O stars in the nebula, indicating that it is probably density bounded.

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