Hostname: page-component-cd9895bd7-q99xh Total loading time: 0 Render date: 2024-12-28T18:56:33.573Z Has data issue: false hasContentIssue false
  • English
  • Français

Cosmic-Ray Exposure Ages of Large Presolar SiC Grains

Published online by Cambridge University Press:  05 March 2013

Frank Gyngard ,
Sachiko Amari ,
Ernst Zinner  and
Ulrich Ott
Frank Gyngard
Affiliation:
Laboratory for Space Sciences and the Physics Department, Washington University, Box 1105, One Brookings Drive, St. Louis, MO 63130, USA
Sachiko Amari
Affiliation:
Laboratory for Space Sciences and the Physics Department, Washington University, Box 1105, One Brookings Drive, St. Louis, MO 63130, USA
Ernst Zinner*
Affiliation:
Laboratory for Space Sciences and the Physics Department, Washington University, Box 1105, One Brookings Drive, St. Louis, MO 63130, USA
Ulrich Ott
Affiliation:
Max-Planck-Institut für Chemie, Becherweg 27, D-55128, Mainz, Germany
*
CCorresponding author. Email: ekz@wustl.edu
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Among presolar SiC grains found in the Murchison carbonaceous meteorites (average size less than 0.5 μm) are very large grains, ranging in size up to 50 μm. We interpret 6Li excesses measured in eight of these grains as being the result of spallation reactions by Galactic cosmic rays during the time the grains spent in the interstellar medium before their incorporation into the meteorite. Derived interstellar exposure ages range from 40 My to 1 Gy, the highest values being consistent with theoretical expectations of interstellar grain lifetimes. Although six grains have almost identical C and Si isotopic compositions, their exposure ages are very different. This observation, combined with low trace element contents, and unusual grain sizes, raises fundamental questions about their stellar sources.

Keywords

stardustcircumstellar mattercosmic raysisotopic ratiosISM: kinematics and dynamicsstars: AGB starsstars: winds, outflows
Type
Grains
Information
Publications of the Astronomical Society of Australia , Volume 26 , Issue 3 , 2009 , pp. 278 - 283
Copyright
Copyright © Astronomical Society of Australia 2009

References

Alexander, C. M. O'D., 1993, GeCoA, 57, 2869 Google Scholar
Alexander, C. M. O'D. & Nittler, L. R., 1999, ApJ, 519, 222 Google Scholar
Amari, S., Lewis, R. S. & Anders, E., 1994, GeCoA, 58, 459 Google Scholar
Amari, S., Hoppe, P., Zinner, E. & Lewis, R. S., 1995, Metic, 30, 679 Google Scholar
Amari, S., Nittler, L. R., Zinner, E., Gallino, R., Lugaro, M. & Lewis, R. S., 2001, ApJ, 546, 248 CrossRefGoogle Scholar
Avila, J. N., Ireland, T. R., Holden, P., Gyngard, F., Bennett, V., Amelin, Y. & Zinner, E., 2007, LPI, 26 Google Scholar
Avila, J. N., Ireland, T. R., Gyngard, F., Amari, S. & Zinner, E., 2008a, 8th Australian Space Science Conference, AbstractGoogle Scholar
Avila, J. N., Ireland, T. R., Holden, P., Gyngard, F., Bennett, V., Amari, S. & Zinner, E., 2008b, M&PS, 43, A20 Google Scholar
Avila, J. N., Ireland, T. R., Gyngard, F.,Amari, S. & Zinner, E., 2009, PASA, 26 Google Scholar
Bernatowicz, T. J., Messenger, S., Pravdivtseva, O., Swan, P. & Walker, R. M., 2003, GeCoA, 67, 4679 CrossRefGoogle Scholar
Bernatowicz, T. J.,Akande, O. W., Croat, T. K. & Cowsik, R., 2005, ApJ, 631, 988 CrossRefGoogle Scholar
Boothroyd, A. I. & Sackmann, I.-J., 1999, ApJ, 510, 232 Google Scholar
Busso, M., Gallino, R. & Wasserburg, G. J., 1999, ARA&A, 37, 239 Google Scholar
Cameron, A. G. W. & Fowler, W. A., 1971, ApJ, 164, 111 Google Scholar
Charbonnel, C., 1995, ApJ, 453, L41 Google Scholar
Clayton, D. D. & Nittler, L. R., 2004, ARA&A, 42, 39 Google Scholar
Clayton, D. D., Obradovic, M., Guha, S. & Brown, L. E., 1991, LPI, 22, 221 Google Scholar
Greiner, D. E., Lindstrom, P. J., Heckman, H. H., Cork, B. & Bieser, F. S., 1975, PhRvL, 35, 152 Google Scholar
Gyngard, F., Amari, S., Zinner, E. & Ott, U., 2009, ApJ, 964, 359 Google Scholar
Heck, P. R. et al., 2008, LPI, 39, 1239 Google Scholar
Heck, P. R. et al., 2009, ApJ, 698, 1155 Google Scholar
Hoppe, P., Amari, S., Zinner, E., Ireland, T. & Lewis, R. S., 1994, ApJ, 430, 870 CrossRefGoogle Scholar
Ireland, T. R., Zinner, E. K. & Amari, S., 1991, ApJ, 376, L53 Google Scholar
Jones, A., Tielens, A., Hollenbach, D. & McKee, C., 1997, in Astrophysical Implications of the Laboratory Study of Presolar Materials, Eds. Bernatowicz, T. J. & Zinner, E. (New York: AIP), 595 Google Scholar
Lewis, R. S., Amari, S. & Anders, E., 1994, GeCoA, 58, 471 CrossRefGoogle Scholar
Lodders, K. & Amari, S., 2005, ChEG, 65, 93 Google Scholar
Lodders, K. & Fegley, B. Jr., 1995, Metic, 30, 661 Google Scholar
Lodders, K. & Fegley, B. Jr., 1997, in Astrophysical Implications of the Laboratory Study of Presolar Materials, Eds. Bernatowicz, T. J. & Zinner, E. (New York: AIP), 391 Google Scholar
Lugaro, M., Zinner, E., Gallino, R. & Amari, S., 1999, ApJ, 527, 369 Google Scholar
Marhas, K. K., Hoppe, P. & Ott, U., 2007, M&PS, 42, 1077 Google Scholar
Mathis, J. S., 1990, ARA&A, 28, 37 Google Scholar
Mathis, J. S., Rumpl, W. & Nordsieck, K. H., 1977, ApJ, 217, 425 Google Scholar
Nittler, L. R. & Alexander, C. M. O. D., 2003, GeCoA, 67, 4961 Google Scholar
Nollett, K. M., Busso, M. & Wasserburg, G. J., 2003, ApJ, 582, 1036 Google Scholar
Ott, U. & Begemann, F., 2000, M&PS, 35, 53 Google Scholar
Ott, U., Altmaier, M., Herpers, U., Kuhnhenn, J., Merchel, S., Michel, R. & Mohapatra, R. K., 2005, M&PS, 40, 1635 Google Scholar
Reedy, R. C., 1987, JGR, 92, E697 CrossRefGoogle Scholar
Reedy, R. C., 1989, LPI, 20, 888 Google Scholar
Russell, S. S., Ott, U.,Alexander, C. M. O. D., Zinner, E. K., Arden, J. W. & Pillinger, C. T., 1997, M&PS, 32, 719 Google Scholar
Sedlmayr, E. & Krüger, D., 1997, in Astrophysical Implications of the Laboratory Study of Presolar Materials, Eds. Bernatowicz, T. J. & Zinner, E. (New York: AIP), 425 Google Scholar
Tang, M. & Anders, E., 1988, ApJ, 335, L31 Google Scholar
Virag, A., Wopenka, B., Amari, S., Zinner, E., Anders, E. & Lewis, R. S., 1992, GeCoA, 56, 1715 Google Scholar
Wasserburg, G. J., Boothroyd, A. I. & Sackmann, I.-J., 1995, ApJ, 447, L37 Google Scholar
Ziegler, J. F., 2004, NIMPB, 219, 1027 Google Scholar
Zinner, E., 2007, in Treatise on Geochemistry Update, Eds. Holland, H.D., Turekian, K. K. & Davis, A. (Oxford: Elsevier Ltd.), 1.02, 1 Google Scholar
Zinner, E., Nittler, L. R., Gallino, R., Karakas, A. I., Lugaro, M., Straniero, O. & Lattanzio, J. C., 2006, ApJ, 650, 350 CrossRefGoogle Scholar
Zinner, E. et al., 2007, GeCoA, 71, 4786 Google Scholar