A survey of the unusual motions in M17 with a Fabry-Perot monochromator

Details A survey of the unusual motions in M17 with a Fabry-Perot monochromator A survey of the unusual motions in M17 with a Fabry-Perot monochromator

Jun 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ap%26ss..35...81e&link_type=abstract

Astrophysics and Space Science, vol. 35, June 1975, p. 81-96. Research supported by the Science Research Council.

Astronomy and Astrophysics

Astrophysics

17

Fabry-Perot Interferometers, Hydrogen Clouds, Line Shape, Monochromators, Oxygen Spectra, Astronomical Models, Forbidden Transitions, Ion Motion, Nebulae, Optical Reflection, Oxygen Ions, Radial Velocity

Scientific paper

The results of the most extensive survey ever undertaken of the profiles of the O III forbidden line over M17 are presented. These were obtained with an optically-contacted pressure-scanned single-etalon Fabry-Perot monochromator used on the 74-in. Radcliffe reflector. Some very unusual velocity features have been revealed. Several regions were found to be emitting lines split by motions of 20 km/s, whereas others produce lines with three or more separate velocity components which stretch up to -70 km/s from the mean radial velocity of the nebula. Some speculative explanations for these motions are offered.

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