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Title:
An observational approach to the early stages of stellar evolution
Authors:
Ambartsumian, V. A.; Mirzoian, L. V.
Affiliation:
AA(Biurakanskaia Astrofizicheskaia Observatoriia, Yerevan, Armenian SSR), AB(Biurakanskaia Astrofizicheskaia Observatoriia, Yerevan, Armenian SSR)
Publication:
Astrophysics and Space Science, vol. 84, no. 2, June 1982, p. 317-330. (Ap&SS Homepage)
Publication Date:
06/1982
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
NEBULAE, PROTOSTARS, STELLAR EVOLUTION, T TAURI STARS, CELESTIAL BODIES, FLARE STARS, MATTER (PHYSICS), STELLAR LUMINOSITY, STELLAR MASS, WATER MASERS
Comment:
A&AA ID. AAA032.065.012
DOI:
10.1007/BF00651314
Bibliographic Code:
1982Ap&SS..84..317A

Abstract

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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