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Injection of freshly synthesized ^(41)Ca in the early solar nebula by an asymptotic giant branch star

Wasserburg, G. J. and Gallino, R. and Busso, M. and Goswami, J. N. and Raiteri, C. M. (1995) Injection of freshly synthesized ^(41)Ca in the early solar nebula by an asymptotic giant branch star. Astrophysical Journal Letters, 440 (2). L101-L104. ISSN 2041-8205. doi:10.1086/187771.

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We show that ejecta from the envelope of one asymptotic giant branch star of M ~ 3 M_☉ may account for many of the short-lived nuclei in the early solar system and also for the recent evidence of the presence of ^(41)Ca (t_(41) = 1.50 x 10^5 yr) in early solar nebular condensates. This would require that the injection into the protosolar molecular cloud took place within a narrow time interval of (5-7) x 10^5 yr before the formation of the solar system. If true, this places extremely tight constraints on the whole process of injection mixing and collapse. The timescales for both ^(41)Ca and ^(26)AI require that the placental medium be a dense molecular cloud (2 x 10^3-8 x 10^3 H cm^(-3)). If the observed residual ^(41)Ca is instead produced by a proton bombardment mechanism within the early solar system, similar to what appears necessary to explain ^(53)Mn, then the time interval is relaxed but would still be (1-2) x 10^6 yr from consideration of ^(26)Al.

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Wasserburg, G. J.0000-0002-7957-8029
Additional Information:© 1995 American Astronomical Society. Received 1994 August 29; accepted 1994 December 2. The authors wish to thank C. Wagemans for sharing with us the early results of his studies of neutron capture on ^(41)Ca. Comments and criticisms by A. G. W. Cameron are greatly appreciated. Without E-mail and fax this work would not have been possible. This work was supported by NASA grant NAGW-3337, Division Contribution 5435(866).
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Subject Keywords:ISM: abundances, nuclear reactions, nucleosynthesis, abundances, solar system: formation- stars: AGB and post-AGB
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Caltech Division of Geological and Planetary Sciences5435
Lunatic Asylum Lab866
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Official Citation:Injection of freshly synthesized Ca-41 in the early solar nebula by an asymptotic giant branch star Wasserburg, G. J.; Gallino, R.; Busso, M.; Goswami, J. N.; Raiteri, C. M. Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 440, no. 2, p. L101-L104 1995
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43053
Deposited By: Ruth Sustaita
Deposited On:17 Dec 2013 23:25
Last Modified:10 Nov 2021 16:32

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