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Author
P. Deroo
H. van Winckel
M. Min
L.B.F.M. Waters
T. Verhoelst
W. Jaffe
S. Morel
F. Paresce
A. Richichi
P. Stee
M. Wittkowski
Year
2006
Title
Resolving the compact dusty discs around binary post-AGB stars using N-band interferometry
Journal
Astronomy & Astrophysics
Volume | Issue number
450 | 1
Pages (from-to)
181-192
Document type
Article
Faculty
Faculty of Science (FNWI)
Institute
Anton Pannekoek Institute for Astronomy (API)
Abstract
We present the first mid-IR long baseline interferometric observations of the circumstellar matter around binary post-AGB stars. Two objects, SX Cen and HD 52961, were observed using the VLTI/MIDI instrument during Science Demonstration Time. Both objects are known binaries for which a stable circumbinary disc is proposed to explain the SED characteristics. This is corroborated by our N-band spectrum showing a crystallinity fraction of more than 50% for both objects, pointing to a stable environment where dust processing can occur. Surprisingly, the dust surrounding SX Cen is not resolved in the interferometric observations providing an upper limit of 11 mas (or 18  AU at the distance of this object) on the diameter of the dust emission. This confirms the very compact nature of its circumstellar environment. The dust emission around HD 52961 originates from a very small but resolved region, estimated to be ~35 mas at 8 m and ~55 mas at 13 m. These results confirm the disc interpretation of the SED of both stars. In HD 52961, the dust is not homogeneous in its chemical composition: the crystallinity is clearly concentrated in the hotter inner region. Whether this is a result of the formation process of the disc, or due to annealing during the long storage time in the disc is not clear.
URL
go to publisher's site
Link
Link
Language
English
Note
© EDP Sciences 2006
Permalink
http://hdl.handle.net/11245/1.418603
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  • 214295y.pdf

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