An observational approach to the early stages of stellar evolution

Details An observational approach to the early stages of stellar evolution An observational approach to the early stages of stellar evolution

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..84..317a&link_type=abstract

Astrophysics and Space Science, vol. 84, no. 2, June 1982, p. 317-330.

Physics

10

Nebulae, Protostars, Stellar Evolution, T Tauri Stars, Celestial Bodies, Flare Stars, Matter (Physics), Stellar Luminosity, Stellar Mass, Water Masers

Scientific paper

During the last three decades an observational approach has been applied at the Byurakan Astrophysical Observatory to the problems of the evolution of astronomical bodies and systems. In contradistinction to the traditional point of view which assumes that the processes of condensation are dominant in the universe, this approach makes use of the observed predominance of expansions, ejections, and explosions. The observational approach considers as a phenomenon of primary importance the formation of nebulae as a consequence of the activity of dense bodies (nebulae surrounding the novae, planetary nebulae, supernova remnants, cometary nebulae, and the diffuse nebulae in OB-associations). The new approach in application to the early stages of stellar evolution is discussed. The T Tauri-stage is considered as a phase following the more dense protostellar state. The flare stars are regarded as the next phase of evolution. The phenomena of fuors (FU Ori-type brightenings) can be considered as an expression of the same tendency (the transformation of dense matter into a rarefied state).

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