Hostname: page-component-6bf8c574d5-956mj Total loading time: 0 Render date: 2025-02-17T17:31:39.740Z Has data issue: false hasContentIssue false
  • English
  • Français

Central stars of planetary nebulae: The white dwarf connection

Published online by Cambridge University Press:  30 August 2012

Klaus Werner
Klaus Werner*
Affiliation:
Institute for Astronomy and Astrophysics, Kepler Center for Astro and Particle Physics, Eberhard Karls University, Sand 1, 72076 Tübingen, Germany email: [email protected]
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.

This paper is focused on the transition phase between central stars and white dwarfs, i.e. objects in the effective temperature range 100 000 – 200 000 K. We confine our review to hydrogen-deficient stars because the common H-rich objects are subject of the paper by Ziegler et al. in these proceedings. We address the claimed iron-deficiency in PG1159 stars and [WC] central stars. The discovery of new Ne vii and Ne viii lines in PG1159 stars suggests that the identification of O vii and O viii lines that are used for spectral classification of [WCE] stars is wrong. We then present evidence for two distinct post-AGB evolutionary sequences for H-deficient stars based on abundance analyses of the He-dominated O(He) stars and the hot DO white dwarf KPD 0005+5106. Finally, we report on evidence for an H-deficient post-super AGB evolution sequence represented by the hottest known, carbon/oxygen-atmosphere white dwarf H 1504+65 and the recently discovered carbon-atmosphere “hot DQ” white dwarfs.

Keywords

stars: abundancesstars: AGB and post-AGBstars: atmospheresstars: early-typestars: evolutionwhite dwarfsplanetary nebulae: generalultraviolet: stars
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S283: Planetary Nebulae: An Eye to the Future , July 2011 , pp. 196 - 203
Copyright
Copyright © International Astronomical Union 2012

References

Acker, A. & Neiner, C. 2003, A&A, 403, 659 Google Scholar
Althaus, L. G., Panei, J. A., Miller Bertolami, M. M., García-Berro, E., Córsico, A. H., Romero, A. D., Kepler, S. O., & Rohrmann, R. D. 2009, ApJ, 704, 1605 CrossRefGoogle Scholar
Barlow, M. J., Blades, J. C., & Hummer, D. G. 1980, ApJ (Letters), 241, L27 CrossRefGoogle Scholar
Crowther, P. A. 2008, in: Werner, K. & Rauch, T. (eds.), Hydrogen-Deficient Stars, ASP-CS (ASP: San Francisco), 391, 83 Google Scholar
Crowther, P. A., De Marco, O., & Barlow, M. J. 1998, MNRAS, 296, 367 CrossRefGoogle Scholar
Dufour, P., Liebert, J., Fontaine, G., & Behara, N. 2007, Nature, 450, 522 CrossRefGoogle Scholar
Dufour, P., Béland, S., Fontaine, G., Chayer, P., & Bergeron, P. 2011, ApJ (Letters), 733, L19 CrossRefGoogle Scholar
Gänsicke, B. T., Koester, D., Girven, J., Marsh, T. R., & Steeghs, D. 2010, Science, 327, 188 CrossRefGoogle Scholar
Henry, R. B. C., Skinner, J. N., Kwitter, K. B., & Milingo, J. B. 2006, in: Barlow, M. J. & Méndez, R.H. (eds.), Planetary Nebulae in our Galaxy and Beyond, Proc. IAU Symp. No. 235 (Cambridge: Cambridge University Press), p. 417 Google Scholar
Iben, I. Jr., Ritossa, C., & García-Berro, E. 1997, ApJ, 489, 772 CrossRefGoogle Scholar
Jahn, D., Rauch, T., Reiff, E., Werner, K., Kruk, J. W., & Herwig, F. 2007, A&A, 462, 281 Google Scholar
Jeffery, C. S. 2008, in: Werner, K. & Rauch, T. (eds.), Hydrogen-Deficient Stars, ASP-CS (ASP: San Francisco), 391, 3 Google Scholar
Jeffery, C. S., Karakas, A. I., & Saio, H. 2011, MNRAS, 414, 3599 CrossRefGoogle Scholar
Juett, A. M., Psaltis, D., & Chakrabarty, D. 2001, ApJ, 560, L59 CrossRefGoogle Scholar
Keller, G. R., Herald, J. E., Bianchi, L., Maciel, W. J., & Bohlin, R. C. 2011, MNRAS, 418, 705 CrossRefGoogle Scholar
Livio, M. & Truran, J. W. 1994, ApJ, 425, 797 CrossRefGoogle Scholar
Longland, R., Lorén-Aguliar, P., José, J., García-Berro, E., Althaus, L. G., & Isern, J. 2011, ApJ (Letters), 737, L34 CrossRefGoogle Scholar
Méndez, R. H., Miguel, C. H., Heber, U., & Kudritzki, R. P. 1986, in: Hunger, K., Schönberner, D., & Rao, N. K. (eds.), Hydrogen Deficient Stars and Related Objects, Proc. IAU Coll. No. 87 (Reidel: Dordrecht), p. 323 CrossRefGoogle Scholar
Miller Bertolami, M. M. & Althaus, L. G. 2006, A&A, 454, 845 Google Scholar
Miller Bertolami, M. M., Althaus, L. G., Olano, C., & Jiménez, N. 2011, MNRAS, 415, 1396 CrossRefGoogle Scholar
Rao, N. K. & Lambert, D. L. 1996, in: Jeffery, C. S. & Heber, U. (eds.), Hydrogen-Deficient Stars, ASP-CS (ASP: San Francisco), 96, 43 Google Scholar
Rauch, T., Dreizler, S., & Wolff, B. 1998, A&A, 338, 651 Google Scholar
Rauch, T., Reiff, E., Werner, K., & Kruk, J. W. in: Werner, K. & Rauch, T. (eds.), Hydrogen-Deficient Stars, ASP-CS (ASP: San Francisco), 391, 135 Google Scholar
Siess, L. 2007, A&A, 476, 893 Google Scholar
Todt, H., Peña, M., Hamann, W.-R., & Gräfener, G. 2010a, in: Werner, K. & Rauch, T. (eds.), 17th European White Dwarf Workshop, AIP-CP (Melville: New York), 1273, 219 Google Scholar
Todt, H., Peña, M., Hamann, W.-R., & Gräfener, G. 2010b, A&A, 515, A83 Google Scholar
Wassermann, D., Werner, K., Rauch, T., & Kruk, J. W. 2010, A&A, 524, A9 Google Scholar
Weidemann, V. 2003, in de Martino, D., Silvotti, R., Solheim, J.-E. & Kalytis, R. (eds.), White Dwarfs, NATO Sci. Ser. II (Kluwer: Dordrecht), 105, 3 CrossRefGoogle Scholar
Werner, K. 1991, A&A, 251, 147 Google Scholar
Werner, K. & Wolff, B. 1999, A&A, 347, L13 Google Scholar
Werner, K. & Herwig, F. 2006, PASP, 118, 183 CrossRefGoogle Scholar
Werner, K., Rauch, T., Barstow, M. A., & Kruk, J. W. 2004, A&A, 421, 1169 Google Scholar
Werner, K., Rauch, T., & Kruk, J. W. 2007, A&A, 466, 317 Google Scholar
Werner, K., Rauch, T., Reiff, E., & Kruk, J. W. 2008, in: Werner, K. & Rauch, T. (eds.), Hydrogen-Deficient Stars, ASP-CS (ASP: San Francisco), 391, 109 Google Scholar
Werner, K., Rauch, T., & Kruk, J. W. 2010, ApJ (Letters), 719, L32 CrossRefGoogle Scholar
Werner, K., Rauch, T., Kruk, J. W., & Kurucz, R. L. 2011, A&A, 531, A146 Google Scholar