Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986avest..20...35i&link_type=abstract
Astronomicheskii Vestnik (ISSN 0320-930X), vol. 20, Jan.-Mar. 1986, p. 35-49. In Russian.
Astronomy and Astrophysics
Astronomy
Accretion Disks, Chondrites, Interstellar Matter, Meteoritic Composition, Planetary Nebulae, Astronomical Models, Condensing, Cosmic Gases, Gas Density, Gas Temperature, Stellar Composition
Scientific paper
The accretion-disk model of the preplanetary nebula leads to the hypothesis that a significant part of the solid matter of the nebula was formed through the successive condensation of gas components of solar composition as this gas moved from the hot dense region near the primordial sun toward the periphery of the nebula in a region with decreasing temperature and pressure. This hypothesis removes the contradiction between the presence of traces of high-temperature phenomena in chondrites and the conclusion that high temperatures never existed in the nebula at distances of 2-4 AU from the sun, from which meteorites approach the earth. The hypothesis also implies that the mass and angular momentum of the nebula were close to their minimum possible values, and that the loss of the nebula gas began in the final stage of nebula formation.
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