Available formats: HTML | PDF | (gzipped) PostScript
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
Received 4 February 2000 / Accepted 28 September 2000
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 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).
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
Online publication: January 29, 2001