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The Properties of the PDS Li-rich Giant Stars

  • C. A. O. Torres (a1), G. R. Quast (a1), R. de la Reza (a2) and L. da Silva (a2)

Abstract

In the Pico dos Dias Survey (PDS), devised to search for young stellar objects, we found also K giants presenting moderate to strong Lithium lines associated with IRAS sources. But there are some gK with weak or absent Li lines too. There is a dichotomy in the distribution of the IRAS spectral indices between both kinds of K stars. A model of an expanding shell with a mass-dependent velocity may explain this behavior, if the photospheric Li depletion takes only ˜2500 yrs.

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References

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de la Reza, R., Drake, N. A., & da Silva, L. 1996, ApJ, 456, L115
de la Reza, R., Drake, N. A., da Silva, L., Torres, C. A. O., & Martin, E. L. 1997, ApJ, 482, L80
Fekel, F. C., Webb, R. A., White, R. J., & Zuckerman, B. 1996 ApJ 462, L95
Gregorio-Hetem, J., Lépine, J. R. D., Quast, G. R., Torres, C. A. O., & de la Reza, R. 1992, AJ, 103, 549
Hu, J. Y., Slijkhuis, S., De Jong, T., Jiang, B. W. 1993, A&AS, 100, 413
Torres, C. A. O. 1998, Publicação Especial do Observatório Nacional, 10/99
Wouterloot, J. G. A., Brand, J. 1989, A&AS, 80, 149

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