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Near-Infrared Monitoring of the Carbon Star IRC +10 216: A High Spatial-Resolution Time Sequence of Dust-Shell Evolution

Published online by Cambridge University Press:  26 May 2016

G. Weigelt ,
T. Blöcker ,
K.-H. Hofmann ,
A. Men'shchikov ,
J. M. Winters  and
Y. Balega
G. Weigelt
Affiliation:
Max–Planck–Institut für Radioastronomie, 53121 Bonn, Germany
T. Blöcker
Affiliation:
Max–Planck–Institut für Radioastronomie, 53121 Bonn, Germany
K.-H. Hofmann
Affiliation:
Max–Planck–Institut für Radioastronomie, 53121 Bonn, Germany
A. Men'shchikov
Affiliation:
Max–Planck–Institut für Radioastronomie, 53121 Bonn, Germany
J. M. Winters
Affiliation:
Max–Planck–Institut für Radioastronomie, 53121 Bonn, Germany
Y. Balega
Affiliation:
Special Astrophysical Observatory, Nizhnij Arkhyz, 35147, Russia

Extract

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The carbon star IRC +10 216 is a long-period Asymptotic Giant Branch (AGB) star suffering from strong stellar winds (several 10-5 M⊙/yr; Loup et al. 1993) which have led to an almost complete obscuration of the star by dust. Due to the high mass-loss rate, long period of P = 649 d (Le Bertre 1992), and carbon-rich chemistry of the dust-shell, IRC +10 216 is obviously in a very advanced stage of its AGB evolution. High-resolution near-infrared imaging of IRC +10 216 has revealed that on sub-arcsecond scales (100 mas) its dust shell is clumpy, bipolar, and changing on a time scale of only ~1 yr (Weigelt et al. 1997, 1998, Haniff & Buscher 1998, Osterbart et al. 2000, Tuthill et al. 2000). Since most dust shells around AGB stars are known to be spherically symmetric, whereas most proto-planetary nebulae (PPN) show an axisymmetric geometry (Olofsson 1996), it appears likely that IRC +10 216 has already entered the transition phase to the PPN stage. This suggests that the break of the dust-shell symmetry between the AGB and post-AGB phase already takes place at the end of the AGB evolution.

Type
Part III: Planetary Nebulae in the Scheme of Stellar Evolution
Information
Symposium - International Astronomical Union , Volume 209: Planetary Nebulae: Their Evolution and Role in the Universe , 2003 , pp. 83 - 84
Copyright
Copyright © Astronomical Society of the Pacific 2003 

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