Astronomy and Astrophysics – Astronomy
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...190.4905s&link_type=abstract
American Astronomical Society, 190th AAS Meeting, #49.05; Bulletin of the American Astronomical Society, Vol. 29, p.845
Astronomy and Astrophysics
Astronomy
1
Scientific paper
We will review current ideas concerning the formation of sunlike stars and planetary systems. In particular, we discuss the idea that the chondrules and CAIs found in chondritic meteorites might have been formed as solids entrained and melted in the bipolar wind that results from the interaction of the accreting protosolar nebula and the magnetosphere of the young protosun. Aerodynamic sorting and a mechanical selection for molten droplets that rain back onto the disk at planetary distances explain the size distributions and patterns of element segregation that we observe in carbonaceous and ordinary chondrties. Cosmic ray ions generated in the flares that accompany the general magnetic activity of the inner region may irradiate the precursor rocks before they are launched in the bipolar wind. Under reasonable scaling assumptions for the efficiency of the process in protostars, cosmic-ray bombardment suffices to generate the short-lived radionuclides (26) Al, (41) Ca, and (53) Mn at their inferred meteoritic levels.
Glassgold Alfred E.
Lee Taegweon
Shang Hsien
Shu Frank H.
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