Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981sciam.245...46w&link_type=abstract
Scientific American, vol. 245, Aug. 1981, p. 46-55.
Astronomy and Astrophysics
Astronomy
4
Gas Temperature, Molecular Clouds, Orion Constellation, Stellar Evolution, Stellar Mass Ejection, Stellar Winds, Hydrogen Clouds, Infrared Radiation, Protostars, Spectrum Analysis, Stellar Luminosity
Scientific paper
New evidence from the Orion constellation indicates that what once were thought to be protostars are more probably very young massive stars shedding mass, which could mean the discovery of a new phase in the evolution of massive stars. Gas temperatures up to 10,000 K, and marked broadening of infrared radiation emissions from within the core of Orion Molecular Cloud 1 (OMC1) suggest recent or current star formation or possibly protostars. These intense emissions have wide Doppler widths of spectral lines, implying velocities between 100 and 150 km/s, and suggesting the presence of a 'wind' blowing out from the infrared cluster. Water maser cloudlets in OMC1 are also moving away from the core. This compact matter involved in the flow from the core is substantial, and has probably passed the stage of accretion that would justify the use of the term protostar but must still be associated with early stages of stellar evolution. This not only means astronomers may have to continue searching for protostars, but must also consider how this recently discovered 'wind' influences the creation of small stars and planetary systems.
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