Open AccessThe dual dust chemistries of planetary nebulae with [WCL] central stars
Author(s) -
Cohen Martin,
Barlow M. J.,
Liu X.W.,
Jones A. F.
Publication year - 2002
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2002.05350.x
Subject(s) - physics , stars , astrophysics , planetary nebula , astronomy , infrared , spectral line , circumstellar dust , spectroscopy
The rather rare class of central stars of planetary nebulae that show very low‐excitation Wolf–Rayet spectra has been a subject of great interest, particularly in the infrared, since its discovery in the late 1960s. Further peculiarities have been found with the advent of infrared spectroscopy from ISO . Notably, these objects simultaneously betray the presence of regions of carbon‐rich and oxygen‐rich dust chemistry. We compare and contrast complete ISO spectra between 2 and 200 μm of a sample of six [WC8] to [WC11] central stars, finding many similarities. Among this sample, one star provides strong evidence of quasi‐periodic light variations, suggestive of a dust cloud orbiting in a plane from which we view the system.