EDP Sciences
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Volume 377, Number 3, October III 2001
Page(s) 1007 - 1015
Section Diffuse matter in space
DOI http://dx.doi.org/10.1051/0004-6361:20011050

A&A 377, 1007-1015 (2001)
DOI: 10.1051/0004-6361:20011050

Infrared properties of planetary nebulae with [WR] central stars

S. K. Górny1, G. Stasinska2, R. Szczerba1 and R. Tylenda1

1  Copernicus Astronomical Centre, Department for Astrophysics, Rabianska 8, 87-100 Torun, Poland
2  Observatoire de Paris-Meudon, DAEC, 92195 Meudon Cedex, France

(Received 9 October 2000 / Accepted 16 July 2001 )

We have gathered from the literature near and mid infrared (photometric and spectroscopic) data for Galactic planetary nebulae, with special attention to planetary nebulae surrounding Wolf-Rayet type central stars ([WR] PN). These data have been analyzed to obtain insight into the dust-properties of [WR] PN and their evolutionary status. We have found that a sizeable fraction of [WR] PN seems to contain hot dust (1000-2000 K), probably located in the winds of the central stars. The mean dust temperature is shown to decrease with decreasing [WC] spectral type. This is in line with suggestions that the [WC] sequence is an evolutionary sequence from late to early types. [WR] PN in different diagrams, when compared to those of non-[WR] PN, suggest that [WR] PN form a homogeneous class of planetary nebulae. There is an unusually large proportion of [WR] PN showing PAH features in their spectra.

Key words: planetary nebulae: general -- stars: AGB and post-AGB -- stars: Wolf-Rayet

Offprint request: S. K. Górny, skg@ncac.torun.pl

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