Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-05-04
Astronomy & Astrophysics 333, L51-L54 (1998)
Astronomy and Astrophysics
Astrophysics
4 pages including 4 PostScript figures, A&A (Letter), also available from http://www.speckle.mpifr-bonn.mpg.de/publications.ht
Scientific paper
We present the first K'-band image of the carbon star IRC+10216 with 76 mas resolution. The diffraction-limited image was reconstructed from 6m telescope speckle data using the speckle masking bispectrum method. The image shows that the dust shell of IRC+10216 is extremely clumpy. Five individual clouds within a 210 mas radius of the central star have been resolved for the first time. On the basis of consistent theoretical models we argue that these structures are produced by circumstellar dust formation. The fragmentation of the shell structure gives most likely direct evidence for an inhomogeneous mass-loss process which may be interpreted in terms of large-scale surface convection-cells (Schwarzschild 1975) being a common phenomenon for red giants.
Balega Yuri Yu.
Bloecker Th.
Fleischer A. J.
Osterbart Roger
Weigelt Gerd
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