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[WN] central stars of planetary nebulae

  • H. Todt (a1), B. Miszalski (a2), J. A. Toalá (a3) (a4) and M. A. Guerrero (a4)

While most of the low-mass stars stay hydrogen-rich on their surface throughout their evolution, a considerable fraction of white dwarfs as well as central stars of planetary nebulae have a hydrogen-deficient surface composition. The majority of these H-deficient central stars exhibit spectra very similar to massive Wolf-Rayet stars of the carbon sequence, i.e. with broad emission lines of carbon, helium, and oxygen. In analogy to the massive Wolf-Rayet stars, they are classified as [WC] stars. Their formation, which is relatively well understood, is thought to be the result of a (very) late thermal pulse of the helium burning shell. It is therefore surprising that some H-deficient central stars which have been found recently, e.g. IC 4663 and Abell 48, exhibit spectra that resemble those of the massive Wolf-Rayet stars of the nitrogen sequence, i.e. with strong emission lines of nitrogen instead of carbon. This new type of central stars is therefore labelled [WN]. We present spectral analyses of these objects and discuss the status of further candidates as well as the evolutionary status and origin of the [WN] stars.

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Acker, A. & Neiner, C., 2003, A&A, 403, 659
Althaus, L. G., Serenelli, A. M., Panei, J. A., et al. 2005, A&A, 435, 631
Crowther, P. A. & Walborn, N. R., 2011, MNRAS, 416, 1311
DePew, K., Parker, Q. A., Miszalski, B., De Marco, O., Frew, D. J., Acker, A., Kovacevic, A. V., Sharp, R. G., 2011, MNRAS, 414, 2812
Frew, D. J., Bojičić, I. S., Parker, Q. A., et al. 2014, MNRAS, 440, 1345
García-Rojas, J., Peña, M., & Peimbert, A., 2009, A&A, 496, 139
Herwig, F., 2001, Ap&SS, 275, 15
Iben, I. Jr. & MacDonald, J. 1995, in Lecture Notes in Physics, Berlin Springer Verlag, Vol. 443, White Dwarfs, ed. Koester, D. & Werner, K., 48
Méndez, R. H. 1989, in IAU Symposium, Vol. 131, Planetary Nebulae, ed. Torres-Peimbert, S., 261–272
Miszalski, B., Crowther, P. A., De Marco, O., et al. 2012, MNRAS, 423, 934
Morgan, D. H., Parker, Q. A., & Cohen, M., 2003, MNRAS, 346, 719
Reindl, N., Rauch, T., Werner, K., Kruk, J. W., & Todt, H., 2014, A&A, 566, A116
Riesgo-Tirado, H. & López, J. A. 2002, in RMxAC, ed. Henney, W. J., Franco, J., & Martos, M., Vol. 12, 174–174
Smith, L. F. & Aller, L. H., 1969, ApJ, 157, 1245
Todt, H., Peña, M., Hamann, W.-R., & Gräfener, G., 2010, A&A, 515, A83
Wachter, S., Mauerhan, J. C., Van Dyk, S. D., Hoard, D. W., Kafka, S., Morris, P. W., 2010, AJ, 139, 2330
Werner, K. 2012, in IAU Symposium, Vol. 283, IAU Symposium, 196–203
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Proceedings of the International Astronomical Union
  • ISSN: 1743-9213
  • EISSN: 1743-9221
  • URL: /core/journals/proceedings-of-the-international-astronomical-union
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