2007A&A...467.1093D -
Astronomy and Astrophysics, volume 467, 1093-1101 (2007/6-1)
The circumbinary disc around the J-type C-star IRAS 18006-3213.
DEROO P., VAN WINCKEL H., VERHOELST T., MIN M., REYNIERS M. and WATERS L.B.F.M.
Abstract (from CDS):
In the generally accepted, but poorly documented model, silicate J-type C-stars are binary objects for which the silicate emission originates from a circumbinary or a circumcompanion disc. We aim at testing this hypothesis by a thorough spectral and spatial observational study of one object:
IRAS 18006-3213. We obtained, analysed and modeled high spatial resolution interferometric VLTI/MIDI observations on multiple baselines ranging from 45m to 100m. All observations resolved the object and show the very compact nature of the N-band emission (∼30mas). In addition, the highest spatial resolution data show a significant differential phase jump around 8.3µm. This demonstrates the asymmetric nature of the N-band emission. Moreover, the single telescope N-band spectrum shows the signature of highly processed silicate grains. These data are used to confirm the model on silicate J-type C-stars for
IRAS 18006-3213. We show that the most favourable model of the dust geometry is a stable circumbinary disc around the system, seen under an intermediate inclination. The data presented on the silicate J-type C-star
IRAS 18006-3213 provide evidence that the oxygen rich dust is trapped in a circumbinary disc. The formation of this disc is probably linked to the binary nature of the central star.
Abstract Copyright:
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Journal keyword(s):
techniques: interferometric - stars: AGB and post-AGB - stars: carbon - stars: circumstellar matter - stars: individual: IRAS 18006-3213
Simbad objects:
12
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