Published in:

Astrophysical Journal 725,1 (2010) 443-449;


We propose a model for the incorporation of Be-10 within calcium-aluminum inclusions (CAIs) in primitive carbonaceous meteorites. In this model, Be-10 is produced by energetic particle reactions in the proto-solar atmosphere of a more active proto-Sun characterized by energetic particle fluxes higher than contemporary particle fluxes. This Be-10 is incorporated into the solar wind that is then implanted into CAI precursor material. This production mechanism is operational in the contemporary solar system implanting Be-10 in lunar materials. The contemporary production rate of Be-10 at the surface of the Sun is similar to 0.1 Be-10 cm(-2) s(-1). Scaling up the contemporary Be-10 production in the proto-Sun by a factor of 10(5) would increase the production rate to 10(4) Be-10 cm(-2) s(-1). Using this enhanced production value in conjunction with refractory mass inflow rates at 0.06 AU from the proto-Sun we model Be-10 concentrations in CAI precursors. We calculate the content of solar-wind-implanted Be-10 would have been of the order of 10(12) Be-10 g(-1) in CAIs, consistent with initial(10)Be content found from boron-beryllium isotopic systematics in CAIs.

Date of this Version




To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.