Summary
The hydrogen-deficiency in extremely hot post-AGB stars of spectral class PG1159 is probably caused by a (very) late helium-shell flash or a AGB final thermal pulse that consumes the hydrogen envelope, exposing the usually-hidden intershell region. Thus, the photospheric element abundances of these stars allow us to draw conclusions about details of nuclear burning and mixing processes in the precursor AGB stars. We compare predicted element abundances to those determined by quantitative spectral analyses performed with advanced non-LTE model atmospheres. A good qualitative and quantitative agreement is found for many species (He, C, N, O, Ne, F, Si, Ar) but discrepancies for others (P, S, Fe) point at shortcomings in stellar evolution models for AGB stars. Almost all of the chemical trace elements in these hot stars can only be identified in the UV spectral range. The Far Ultraviolet Spectroscopic Explorer and the Hubble Space Telescope played a crucial role for this research.
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References
Blöcker, T. 1995, A&A, 299, 755
Clayton, G. C. & De Marco, O. 1997, AJ, 114, 2679
Duerbeck, H. W. & Benetti, S. 1996, ApJ Lett., 468, L111
Gonzalez, G., Lambert, D. L., Wallerstein, et al.1998, ApJS, 114, 133
Hamann, W.-R. 1997, IAU Symp. 180, ed. H. J. Habing & H. J. G. L. M. Lamers (Kluwer), 91
Herwig, F. 2003, IAU Symp. 209, ed. S. Kwok, M. Dopita, & R. Sutherland, ASP, 111
Herwig, F., Blöcker, T., Langer, N., & Driebe, T. 1999, A&A, 349, L5
Iben, Jr., I., Kaler, J. B., Truran, J. W., & Renzini, A. 1983, ApJ, 264, 605
Jahn, D., Rauch, T., Reiff, E., Werner, K., Kruk, J. W., & Herwig, F. 2007, A&A, 462, 281
Jorissen, A., Smith, V. V., & Lambert, D. L. 1992, A&A, 261, 164
Lugaro, M., Ugalde, C., Karakas, A. I., et al.2004, ApJ, 615, 934
Pavlenko, Ya. V., Geballe, T. R., Evans, A., et al.2004, A&A, 417, L39
Reiff, E., Rauch, T., Werner, K., Kruk, J. W., & Herwig, F. 2007, in 15th European Workshop on White Dwarfs, eds. R. Napiwotzki, M.R. Burleigh, ASP Conference Series, 372, 237
Schönberner, D. 1983, ApJ, 272, 708
Werner, K. & Rauch, T. 1994, A&A, 284, L5
Werner, K. & Herwig, F. 2006, PASP, 118, 183
Werner, K., Heber, U., & Hunger, K. 1991, A&A, 244, 437
Werner, K., Deetjen, J. L., Dreizler, S., et al.2003, IAU Symp. 209, ed. S. Kwok, M. Dopita, & R. Sutherland, ASP, 169
Werner, K., Rauch, T., Reiff, E., Kruk, J. W., & Napiwotzki, R. 2004, A&A, 427, 685
Werner, K., Rauch, T., & Kruk, J. W. 2005, A&A, 433, 641
Werner, K., Rauch, T., & Kruk, J. W. 2007a, A&A, 466, 317
Werner, K., Rauch, T., & Kruk, J. W. 2007b, A&A, 474, 591
Wood, P. R. & Faulkner, D. J. 1986, ApJ, 307, 659
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Werner, K. (2010). Element Abundance Determination in Hot Evolved Stars. In: Chaudhuri, R., Mekkaden, M., Raveendran, A., Satya Narayanan, A. (eds) Recent Advances in Spectroscopy. Astrophysics and Space Science Proceedings. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-10322-3_19
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DOI: https://doi.org/10.1007/978-3-642-10322-3_19
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