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Abundances of Actinides and Short-lived Nonactinides in the Interstellar Medium: Diverse Supernova Sources for the r-Processes

Wasserburg, G. J. and Busso, M. and Gallino, R. (1996) Abundances of Actinides and Short-lived Nonactinides in the Interstellar Medium: Diverse Supernova Sources for the r-Processes. Astrophysical Journal Letters, 466 (2). L109-L113. ISSN 2041-8205. http://resolver.caltech.edu/CaltechAUTHORS:20131119-095431840

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Abstract

Abundances of ^(244)Pu, ^(235)U, ^(238)U, and ^(232)Th in the early solar system are about those expected for uniform production over most of galactic history. The inferred abundance of 182Hf is also compatible with this model. We here associate production of ^(182)Hf with the same r-process SN sources that produce actinides (SNACS). This requires that r-process nucleosynthesis in SNACS took place rather uniformly over the age of the galaxy until ~10^7 yr prior to solar system formation. The low abundance of ^(107)Pd and ^(129)I in the early solar system indicates that SNACS cannot produce these nuclei at the high yields expected from standard r-process models. We propose that there are distinctive SN sources for different r-process nuclei with a sharp distinction in different SN contributions below and above A ~ 140. Abundances in stars with very low metallicities will vary depending on the type of SN contributing to the local region of star formation. A time scale of ~10^7 yr is much shorter than the 108 yr time usually associated with processes in the galaxy and with the last time of r-process injection accounting for ^(129)I, but may be compatible with the rate of SN occurrence. The hypothesis of a nearby SN polluting the protosolar nebula is critically discussed.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1086/310177DOIArticle
http://iopscience.iop.org/1538-4357/466/2/L109PublisherArticle
Additional Information:© 1996 The American Astronomical Society. Received 1996 April 11; accepted 1996 May 20. We wish to thank W. Sargent, R. Blandford, and R. Kirshner for discussion and particularly thank A. G. W. Cameron and F. X. Timmes for critical and constructive comments. M. B. wishes to thank Caltech and the Lunatic Asylum for hospitality during the early stages of this work. Work supported by NASA grant NAGW-3337. Division Contribution No. 5657(918).
Funders:
Funding AgencyGrant Number
NASANAGW-3337
Subject Keywords:ISM: abundances; nuclear reactions, nucleosynthesis, abundances; solar system: formation; stars: formation; supernovae: general
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Division of Geological and Planetary Sciences5657
Lunatic Asylum Lab918
Record Number:CaltechAUTHORS:20131119-095431840
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20131119-095431840
Official Citation:Abundances of Actinides and Short-lived Nonactinides in the Interstellar Medium: Diverse Supernova Sources for the r-Processes G. J. Wasserburg et al. 1996 ApJ 466 L109
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42558
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:20 Nov 2013 21:09
Last Modified:29 Aug 2014 14:47

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