Physics
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979phys...20..563g&link_type=abstract
Physica Scripta, vol. 20, Nov.-Dec. 1979, p. 563-569. Research supported by the Statens Naturvetenskapliga Forskningsrad and Swe
Physics
2
Chemical Composition, Early Stars, Emission Spectra, Molecular Absorption, Stellar Envelopes, Stellar Spectra, Fluorescence, Interstellar Matter, Line Spectra, Molecular Spectra, Orion Constellation, Particle Emission, T Tauri Stars
Scientific paper
Existing information on observations of molecular emission of absorption at the position of very young stars, stars of the Orion population, is brought together and reviewed in the light of some new information. In spite of several positive detections it is demonstrated that the evidence for a local circumstellar origin of the molecular emission or absorption is very poor. The absence of fluorescent molecular emission in T Tauri stars is used to derive certain restrictions on the abundance of molecules, CH (plus) in particular, around such stars. Three factors which lead to destruction or dispersion of molecules around the stars are discussed. It is found that these processes must play a decisive role in the early life of stars. Since the solar system bears evidence of production of complex molecules it is concluded that if the sun evolved as a typical T Tauri star, then all these molecules found protection in grains and meteorites before the sun became a T Tauri star or they were formed in the grains.
Gahm Goesta F.
Lindroos K. P.
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