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Lithium in Giant Stars

Published online by Cambridge University Press:  25 May 2016

Ramiro de la Reza
Ramiro de la Reza*
Affiliation:
Observatório Nacional, Rio de Janeiro, 20921-400 Brazil

Abstract

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Lithium continues to be a surprising element and more than ever the study of its creation, destruction and distribution is giving us tools to understand, not only the chemical evolution of this element, but also the nature of mass loss of evolved giants and nucleosynthesis of other elements in cases of very low-metal giants. It also helps to set constraints for cosmological models. The presence of very strong lithium lines in some giant stars of different spectral types and stages of evolution has been considered up to the end of the nineties as a puzzle. To solve this problem, non standard evolutionary mechanisms must be invoked. We review here all the mechanisms presented in the literature and which are divided into internal and external processes of lithium enrichment. We will also discuss the observational tests which are being performed in order to discard (or not) some of them. In any case, the more realistic values of the lithium abundances in giants are, as we will see, the main test of these proposed scenarios. Because of this importance we discuss here the state of art of the Non-LTE determinations of lithium abundances in strong lithium giants. Evolved giants, with lithium abundances larger than that of the interstellar medium and with their important mass losses can be considered the most realistic sources of lithium in the Galaxy. We believe that a complete physical picture of this problem will give a powerful tool to understand the chemical evolution of a large part of all light elements.

Type
4. Lithium Abundances
Information
Symposium - International Astronomical Union , Volume 198: The Light Elements and their Evolution , 2000 , pp. 310 - 319
Copyright
Copyright © Astronomical Society of the Pacific 2000 

References

Abia, C., Isern, J. 1997, MNRAS, 289, L11 Google Scholar
Abia, C., Pavlenko, Y., & de Laverny, P. 1999, A&A, 351, 273 Google Scholar
Alexander, J.B. 1967, The Observatory, 87, 238 Google Scholar
Brown, J.A., Sneden, C., Lambert, D.L., & Dutchover, E. 1989, ApJS, 71, 293 Google Scholar
Cameron, A.G.W. 1955, ApJ, 121, 144 Google Scholar
Cameron, A.G.W. & Fowler, W.A. 1971, ApJ, 164, 111 Google Scholar
Carlsson, M., Rutten, R.J., Bruls, J.H.M.J., & Shchukina, N.G. 1994, A&A, 288, 860 Google Scholar
Carney, B.W., Fry, A.M., & Gonzalez, G. 1998, AJ, 116, 2984 Google Scholar
Castilho, B.V. et al. 1999, A&A, 345, 249 Google Scholar
Charbonnel, C. 1994, A&A, 282, 811 Google Scholar
da Silva, L., de la Reza, R., & Barbuy, B. 1995, ApJ, 448, L41 Google Scholar
de la Reza, R. & da Silva, L. 1995, ApJ, 439, 917 Google Scholar
de la Reza, R., Drake, N.A., & da Silva, L. 1996, ApJ, 456, L115 Google Scholar
de la Reza, R., Drake, N.A., da Silva, L., Torres, C.A.O., & Martin, E. L. 1997, ApJ, 482, L77 Google Scholar
de la Reza, R., da Silva, L., Drake, N.A., & Terra, M.A. 2000, ApJ, (Letters May) Google Scholar
de Medeiros, J.R. Melo, C.H. F., & Mayor, M. 1996, A&A, 309, 465 Google Scholar
Drake, N.A. 1998, , Google Scholar
Drake, N.A., de la Reza, R. da Silva, L., & Lambert, D.L. 2000, submitted to the AJ Google Scholar
Fekel, F.C. 1988, A Decade of UV Astronomy with the IUE Satellite, ESA, SP-281, Vol. 1, p. 331 Google Scholar
Fekel, F.C., & Balachandran, S. 1993, ApJ, 403, 708 Google Scholar
Fekel, F.C., Webb, R.A., White, R.J., & Zuckerman, B. 1996, ApJ, 462, L95 CrossRefGoogle Scholar
Gratton, R.G., & D'Antona, F. 1989, A&A, 215, 66 Google Scholar
Gregório-Hetem, J., Lepine, J.R.D., Quast, G.R., Torres, C.A.O., & de la Reza, R. 1992, AJ, 103, 549 CrossRefGoogle Scholar
Gregório-Hetem, J., Castilho, B.V., & Barbuy, B. 1993, A&A, 268, L25 Google Scholar
Hill, V., & Pasquini, L. 1999, A&A, 348, L21 Google Scholar
Kraft, R.P. et al. 1999, ApJ, 518, L53 CrossRefGoogle Scholar
Lim, J., Carilli, C.L., White, S.M., Beasley, J., & Marson, R.G. 1998, Nature, 392, 575 CrossRefGoogle Scholar
Mac Kellar, , 1940, PASP, 52, 407 Google Scholar
Mauron, N., & Huggins, P.J. 1999, A&A, 349, 203 Google Scholar
Mazzitelli, I., D'Antona, F., & Ventura, P. 1999, A&A, 348, 846 Google Scholar
Olofsson, H. et al. 2000, A&A, 353, 583 Google Scholar
Pavlenko, Ya. V., Savanov, I.S., & Yakovina, L.A. 1999, Astron. Rep., 43, 671 Google Scholar
Sackmann, I-J. & Boothroyd, A.I. 1992, ApJ, 392, L71 Google Scholar
Sackmann, I-J. & Boothroyd, A.I. 1999, ApJ, 510, 217 Google Scholar
Siess, L. & Livio, M. 1999a, MNRAS, 304, 925 Google Scholar
Siess, L. & Livio, M. 1999b, MNRAS, 308, 1133 Google Scholar
Skinner, C.J. et al. 1995, ApJ, 444, 861 Google Scholar
Smith, V.V., & Lambert, D.L. 1989, ApJ, 345, 175 Google Scholar
Smith, V.V., Shetrone, M.D. & Keane, M.J. 1999, ApJ, 516, L73 Google Scholar
Terra, M.A. 1997, , Google Scholar
Terra, M.A., de la Reza, R., & Batalha, C. 2000, in preparation Google Scholar
Wallerstein, G. & Sneden, C. 1982, ApJ, 255, 577 CrossRefGoogle Scholar