Hostname: page-component-cd9895bd7-8ctnn Total loading time: 0 Render date: 2024-12-26T06:35:26.212Z Has data issue: false hasContentIssue false
  • English
  • Français

LiBeB Evolution: Three Models

Published online by Cambridge University Press:  25 May 2016

Reuven Ramaty ,
Richard E. Lingenfelter  and
Benzion Kozlovsky
Reuven Ramaty
Affiliation:
NASA/GSFC, Greenbelt, MD 20771, USA
Richard E. Lingenfelter
Affiliation:
CASS/UCSD, LaJolla, CA 92093, USA
Benzion Kozlovsky
Affiliation:
Tel Aviv University, Israel

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.

We consider the three principal LiBeB evolutionary models, CRI in which the cosmic-ray source at all epochs of Galactic evolution is the average ISM, CRI+LECR in which metal enriched low energy cosmic rays (LECRs) are superimposed onto the CRI cosmic rays, and CRS in which the cosmic-ray source, accelerated in superbubbles, is constant, independent of the ISM metallicity. By considering the evolutionary trend of log(Be/H) vs. both [Fe/H] and [O/H], we demonstrate that the CRI model is energetically untenable. We present evolutionary trends for 11B/10B and B/Be which, combined with future precision measurements, could distinguish between the CRS and CRI+LECR models. We show that delayed LiBeB synthesis in the CRS model, due to the transport of the cosmic rays, could explain why log(Be/H) is steeper vs. [O/H] than vs. [Fe/H]. We also show that delayed deposition of Fe into star forming regions, due to its incorporation into high velocity dust, could provide an explanation for the possible rise of [O/Fe] with decreasing [Fe/H]. Observations of refractory and volatile α-elements could test this scenario. There seems to be a need for pregalactic or extragalactic 6Li sources.

Type
2. Production and Destruction of the Elements
Information
Symposium - International Astronomical Union , Volume 198: The Light Elements and their Evolution , 2000 , pp. 51 - 60
Copyright
Copyright © Astronomical Society of the Pacific 2000 

References

Bloemen, H. et al. 1994, A&A, 281, L5 Google Scholar
Bloemen, H. et al. 1999, ApJ, 521, L137 Google Scholar
Boesgaard, A., King, J., Deliyannis, C., & Vogt, S. 1999a, AJ, 117, 492 Google Scholar
Boesgaard, A., Deliyannis, C., King, J., Ryan, S., Vogt, S., & Beers, T. 1999b, AJ, 117, 1548 Google Scholar
Bykov, A., & Bloemen, H. 1994, A&A, 283, L1 Google Scholar
Bykov, A. M., & Fleishman, G. D. 1992, MNRAS, 15, 269 CrossRefGoogle Scholar
Cassé, M., Lehoucq, R., & Vangioni-Flam, E. 1995, Nature, 373, 318 Google Scholar
Chaussidon, M., & Robert, F. 1995, Nature, 374, 337 CrossRefGoogle Scholar
Chaussidon, M., & Robert, F. 1999, Nature, 402, 270 Google Scholar
Duncan, D. K., Lambert, D. L., & Lemke, M., 1992, ApJ, 401, 584 CrossRefGoogle Scholar
Duncan, D. K. et al. 1997, ApJ, 488, 338 Google Scholar
Ellison, D. C., Drury, L.O'C., & Meyer, J-P. 1997, ApJ, 487, 197 Google Scholar
Fields, B. D., & Olive, K. A. 1999, ApJ, 516, 797 Google Scholar
Fulbright, J. P., & Kraft, R. P. 1999, AJ, 118, 527 Google Scholar
Garcia Lopez, R. J. et al. 1998, ApJ, 500, 241 Google Scholar
Grevesse, N., Noels, A., & Sauval, A. J. 1996, in: Cosmic Abundances, eds. Holt, S. S., & Sonneborn, G., ASP Conf. Ser., 99, (San Francisco: ASP), 117 Google Scholar
Higdon, H. C., Lingenfelter, R. E., & Ramaty, R., 1998, ApJ, 509, L33 Google Scholar
Higdon, H. C., Lingenfelter, R. E., & Ramaty, R., 1999, 26th Internat. Cosmic Ray Conf., eds. Kieda, D. et al. (Salt Lake City), 4, 144 Google Scholar
Hobbs, L. M. 1999, in: LiBeB, Cosmic Rays, and Related X- and Gamma-Rays, eds. Ramaty, R. et al., ASP Conf. Ser., 171, (San Francisco: ASP), 23 Google Scholar
Israelian, G., Garcia Lopez, R. J., & Rebolo, R. 1998, ApJ, 507, 805 CrossRefGoogle Scholar
Lambert, D. L. et al. 1998, ApJ, 494, 614 Google Scholar
Lingenfelter, R. E., & Ramaty, R., 1999, 26th Internat. Cosmic Ray Conf., eds. Kieda, D. et al. (Salt Lake City), 4, 148 Google Scholar
Lingenfelter, R. E., Ramaty, R., & Kozlovsky, B. 1998, ApJ, 500, L153 Google Scholar
Meyer, J-P., Drury, L. O'C., & Ellison, D. C. 1997, ApJ, 487, 182 Google Scholar
Molaro, P. 1999, in: LiBeB, Cosmic Rays, and Related X- and Gamma-Rays, eds. Ramaty, R. et al., ASP Conf. Ser., 171, (San Francisco: ASP), 6 Google Scholar
Parizot, E. M. G., Cassé, M., & Vangioni-Flam, E. 1997, A&A, 328, 107 Google Scholar
Ramaty, R. 1996, A&A (Suppl.), 120, C373 Google Scholar
Ramaty, R., Kozlovsky, B., & Lingenfelter, R. E. 1996, ApJ, 456, 525 Google Scholar
Ramaty, R., Kozlovsky, B., Lingenfelter, R., & Reeves, H. 1997, ApJ, 488, 730 CrossRefGoogle Scholar
Ramaty, R., Scully, S., Lingenfelter, R., & Kozlovsky, B. 2000, ApJ, in press Google Scholar
Reeves, H., Fowler, W. A., & Hoyle, F. 1970, Nature, 226, 727 Google Scholar
Ryan, S. G., Norris, J. E., & Beers, T. C. 1996, ApJ, 471, 254 Google Scholar
Ryan, S., Bessell, M., Sutherland, R., & Norris, J. 1990, ApJ, 348, L57 CrossRefGoogle Scholar
Timmes, F. X., Woosley, S. E., & Weaver, T. A., 1995. ApJ(suppl), 98, 617 Google Scholar
Tsujimoto, T., & Shigeyama, T. 1998, ApJ, 508, L151 Google Scholar
Vangioni-Flam, E., Cassé, M., Audouze, J., & Oberto, Y. 1990, ApJ, 364, 568 Google Scholar
Vangioni-Flam, E., Cassé, M., Fields, B., & Olive, K. 1996, A&A, 468, 199 Google Scholar
Westin, J. et al. 1999, ApJ, in press (astro-ph/9910376) Google Scholar
Wiedenbeck, M. E. et al. 1999, ApJ (Letters), 523, L61 Google Scholar
Woosley, S. E. & Weaver, T. A. 1995, ApJS, 101, 181 CrossRefGoogle Scholar