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Astron. Astrophys. 317, L51-L53 (1997)

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Letter to the Editor

Wind fluctuations observed for the [WC9] nucleus of the
planetary nebula BD+30o 3639 *

A. Acker 1, Y. Grosdidier 1, 2 and S. Durand 1

1 URA 1280, Equipe évolution galactique, Observatoire de Strasbourg, 11 rue de l'Université, F-67000 Strasbourg, France
2 Département de Physique, Université de Montréal, CP 6128, Succ. Centre-Ville, Montréal, QC, H3C 3J7, Canada

Received 12 August 1996 / Accepted 19 September 1996

Abstract

The CIII and CIV lines in the [WC9] spectrum of BD+30o 3639 show variable features, interpreted in terms of radiative acceleration of "blobs" forming in the wind. The variations are like those observed for the WC9 massive stars, and the blobs acceleration appears smaller than for the [WC8] nucleus of NGC 40.

Key words: Planetary nebulae: central stars — Stars: Wolf-Rayet, stellar winds

* Based on observations taken at the Observatoire de Haute-Provence (France)

Send offprint requests to: A. Acker

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© European Southern Observatory (ESO) 1997

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