The many, large-scale, velocity components of M17 - observed with an insect-eye Fabry-Perot.
Abstract
An insect-eye Fabry-Perot spectrograph, combined with the 3.8-m Anglo-Australian telescope, has been used to obtain the profiles of the forbidden N II and O III emission lines at many positions over the H II region M17. Many unusual motions have been revealed. Also the motions in the high- and low-excitation gas have been shown to be similar. This substantiates a model for this object in which successive, partial, H I, Mol/H II shells expand (or contract) from (or to) the exciting stars. The source of energy for an expanding situation could be the stellar winds from embedded early-type stars.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- August 1978
- DOI:
- 10.1093/mnras/184.3.527
- Bibcode:
- 1978MNRAS.184..527E
- Keywords:
-
- Astronomical Spectroscopy;
- Emission Spectra;
- Fabry-Perot Spectrometers;
- Nebulae;
- H Alpha Line;
- H Ii Regions;
- Ionized Gases;
- Kinetic Energy;
- Radio Emission;
- Spectral Resolution;
- Stellar Winds;
- Astrophysics;
- Forbidden Lines:H II Regions;
- H II Regions:Internal Motions;
- H II Regions:Line Profiles