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


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

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

Y. Grosdidier 1,2,3, A. Acker 1 and A.F.J. Moffat  **  2,3

1 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 +30o 3639, which was observed intensively during 15 nights. Moving features seen on the top of the CIII [FORMULA]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

© European Southern Observatory (ESO) 2000

Online publication: January 29, 2001

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