Astron. Astrophys. 364, 597-612 (2000)

Turbulent outflows from [WC]-type nuclei of planetary nebulae ^*

I. BD +30^o 3639 and other [WC 9-10] stars

Y. Grosdidier ^1,2,3, A. Acker ¹ and A.F.J. Moffat  <sup>**  2,3

1</sup> Observatoire Astronomique de Strasbourg, UMR 7550, 11 rue de l'Université, 67000 Strasbourg, France (yvesgro@astro.u-strasbg.fr; acker@astro.u-strasbg.fr)
² Université de Montréal, Département de Physique, C.P. 6128, Succursale Centre-Ville, Montréal (Québec) H3C 3J7, Canada (moffat@astro.umontreal.ca; yves@astro.umontreal.ca)
³ Observatoire du mont Mégantic, Canada

Received 4 February 2000 / Accepted 28 September 2000

Abstract

Using spectroscopic observations taken at the Observatoire de Haute-Provence (OHP, France) and the European Southern Observatory (ESO, Chile), we describe wind fluctuations in four [WC 9-10]-type central stars of planetary nebulae, especially BD +30^o 3639, which was observed intensively during 15 nights. Moving features seen on the top of the CIII 5696 emission line are interpreted as outflowing "blobs" which are radially accelerated outwards, as seen in the winds of massive Wolf-Rayet stars. We find line profile variations occurring on a time scale of hours. Kinematic parameters of the blobs are derived and compared to those of massive Wolf-Rayet stars. The wind fragmentation process appears independent of the strong differences between both types of hot stars.

Key words: ISM: planetary nebulae: individual: BD +30O 3639 ISM: planetary nebulae: individual: He 2-99 ISM: planetary nebulae: individual: He 2-142 ISM: planetary nebulae: individual: Sw St 1 stars: mass-loss turbulence

* Mainly based on observations taken at the Observatoire de Haute-Provence, France, and on some observations obtained at the European Southern Observatory, Chile (ESO Prog. IDs: 57.C-0492, 59.C-0293, 61.C-0512).
** Killam Fellow of the Canada Council for the Arts.

Present address: Instituto de Astrofísica de Canarias, Calle Vía Láctea s/n, 38200 La Laguna (Tenerife), Spain

Send offprint requests to: Yves Grosdidier

Correspondence to: Yves Grosdidier

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Contents

• 1. Introduction
  • 1.1. Hot stars showing the Wolf-Rayet phenomenon
  • 1.2. Fragmented, radiatively driven winds
• 2. Observations and data reduction
• 3. The [WC 9] central star of He 2-438: BD +30^o 3639
  • 3.1. Introduction
  • 3.2. Results
    • 3.2.1. Line profile variations
    • 3.2.2. Level of variability
    • 3.2.3. Kinematics of the subpeaks
    • 3.2.4. Kinematics of the subpeaks: Comparison with the -velocity field
    • 3.2.5. The velocity gradient in the line formation region
• 4. Other program stars
  • 4.1. The [WC 9] nucleus of He 2-99
  • 4.2. The [WC 9] nucleus of He 2-142
  • 4.3. The [WC 9-10] nucleus of Sw St 1
• 5. Discussion
• 6. Conclusion
• Acknowledgements
• References

© European Southern Observatory (ESO) 2000

Online publication: January 29, 2001
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