Other
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979rmxaa...4..337r&link_type=abstract
Revista Mexicana de Astronomia y Astrofisica, vol. 4, Aug. 1979, p. 337-340.
Other
5
Fabry-Perot Interferometers, H Ii Regions, Nebulae, Radial Velocity, Cosmic Dust, Emission Spectra, Hydrogen Ions, Interstellar Extinction, Interstellar Matter, Kinematics, Line Spectra, Stellar Evolution
Scientific paper
Radial velocities determined from Fabry-Perot interferograms of the H II region complex composed of the small nebulae S 147, 148 and 149 are discussed. Large internal motions are exhibited in S 148 and S 149; the common velocity of the complex is -62 km/s from which the estimated kinematic distance is 4.3 kpc. S 148 is probably expanding at a rate of 8 km/s. The central star of S 148 shows a reddening of 0.4 magnitudes caused by the high dust content of this nebula. These results indicate that S 148 is probably a young object younger than S 147 and S 149. The nebular complex may therefore be another case where condensations within the same interstellar cloud are at different evolutionary stages.
Pismis Paris
Recillas-Cruz Else
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