The circumstellar envelope of IRC+10216 from milli-arcsecond to arcmin scales

Aims. Analysis of the innermost regions of the carbon-rich star IRC+10216 and of the outer layers of its circumstellar envelope have been performed in order to constrain its mass-loss history. Methods. High dynamic range near infrared adaptive optics and high angular resolution deep V-band images...

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Principais autores:	Leão, I. C., Laverny, P., Mékarnia, D., Medeiros, José Renan de, Vandame, B.
Formato:	article
Idioma:	English
Publicado em:	Astronomy & Astrophysics
Assuntos:	Stars: AGB and post-AGB Stars: variables: general Stars: individual: IRC+10216 Stars: mass-loss Stars: circumstellar matter Techniques: high angular resolution
Endereço do item:	https://repositorio.ufrn.br/jspui/handle/123456789/28886 https://doi.org/10.1051/0004-6361:20054577
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spelling	ri-123456789-288862020-05-10T07:29:57Z The circumstellar envelope of IRC+10216 from milli-arcsecond to arcmin scales Leão, I. C. Laverny, P. Mékarnia, D. Medeiros, José Renan de Vandame, B. Stars: AGB and post-AGB Stars: variables: general Stars: individual: IRC+10216 Stars: mass-loss Stars: circumstellar matter Techniques: high angular resolution Aims. Analysis of the innermost regions of the carbon-rich star IRC+10216 and of the outer layers of its circumstellar envelope have been performed in order to constrain its mass-loss history. Methods. High dynamic range near infrared adaptive optics and high angular resolution deep V-band images of its circumstellar envelope collected with VLT/NACO and VLT/FORS1 instruments have been analyzed. Results. Maps of the sub-arcsecond structures, or clumps, in the innermost regions are derived from the near-infrared observations. The morphology of these clumps is found to strongly vary from J- to L-band. Their relative motion appears to be more complex than proposed in earlier works: they can be weakly accelerated, have a constant velocity, or even be motionless with respect to one another. From V-band imaging, a high spatial resolution map of the shell distribution in the outer layers of IRC+10216 is presented. Shells are well resolved up to a distance of about 90′′ to the core of the nebula and most of them appear to be composed of thinner elongated shells. Finally, by combining the NACO and FORS1 images, a global view, showing both the extended layers and the bipolar core of the nebula together with the real size of the inner clumps is presented. Conclusions. This study confirms the rather complex nature of the IRC+10216 circumstellar environment. In particular, the coexistence at different spatial scales of structures with very di fferent morphologies (clumps, bipolarity and almost spherical external layers) is very puzzling. This confirms that the formation of AGB winds is far more complex than usually assumed in current models. 2020-05-05T13:46:08Z 2020-05-05T13:46:08Z 2006-07-31 article MEDEIROS, José Renan de et al. The circumstellar envelope of IRC+10216 from milliarcsecond to arcmin scales. Astronomy & Astrophysics (Berlin), France, v. 455, n. 1, p. 187-194, 2006. ISSN 1432-0746. DOI https://doi.org/10.1051/0004-6361:20054577. Disponível em: https://www.aanda.org/articles/aa/abs/2006/31/aa4577-05/aa4577-05.html. Acesso em: 5 maio 2020. 0004-6361 (print), 1432-0746 (online) https://repositorio.ufrn.br/jspui/handle/123456789/28886 https://doi.org/10.1051/0004-6361:20054577 en application/pdf Astronomy & Astrophysics
institution	Repositório Institucional
collection	RI - UFRN
language	English
topic	Stars: AGB and post-AGB Stars: variables: general Stars: individual: IRC+10216 Stars: mass-loss Stars: circumstellar matter Techniques: high angular resolution
spellingShingle	Stars: AGB and post-AGB Stars: variables: general Stars: individual: IRC+10216 Stars: mass-loss Stars: circumstellar matter Techniques: high angular resolution Leão, I. C. Laverny, P. Mékarnia, D. Medeiros, José Renan de Vandame, B. The circumstellar envelope of IRC+10216 from milli-arcsecond to arcmin scales
description	Aims. Analysis of the innermost regions of the carbon-rich star IRC+10216 and of the outer layers of its circumstellar envelope have been performed in order to constrain its mass-loss history. Methods. High dynamic range near infrared adaptive optics and high angular resolution deep V-band images of its circumstellar envelope collected with VLT/NACO and VLT/FORS1 instruments have been analyzed. Results. Maps of the sub-arcsecond structures, or clumps, in the innermost regions are derived from the near-infrared observations. The morphology of these clumps is found to strongly vary from J- to L-band. Their relative motion appears to be more complex than proposed in earlier works: they can be weakly accelerated, have a constant velocity, or even be motionless with respect to one another. From V-band imaging, a high spatial resolution map of the shell distribution in the outer layers of IRC+10216 is presented. Shells are well resolved up to a distance of about 90′′ to the core of the nebula and most of them appear to be composed of thinner elongated shells. Finally, by combining the NACO and FORS1 images, a global view, showing both the extended layers and the bipolar core of the nebula together with the real size of the inner clumps is presented. Conclusions. This study confirms the rather complex nature of the IRC+10216 circumstellar environment. In particular, the coexistence at different spatial scales of structures with very di fferent morphologies (clumps, bipolarity and almost spherical external layers) is very puzzling. This confirms that the formation of AGB winds is far more complex than usually assumed in current models.
format	article
author	Leão, I. C. Laverny, P. Mékarnia, D. Medeiros, José Renan de Vandame, B.
author_facet	Leão, I. C. Laverny, P. Mékarnia, D. Medeiros, José Renan de Vandame, B.
author_sort	Leão, I. C.
title	The circumstellar envelope of IRC+10216 from milli-arcsecond to arcmin scales
title_short	The circumstellar envelope of IRC+10216 from milli-arcsecond to arcmin scales
title_full	The circumstellar envelope of IRC+10216 from milli-arcsecond to arcmin scales
title_fullStr	The circumstellar envelope of IRC+10216 from milli-arcsecond to arcmin scales
title_full_unstemmed	The circumstellar envelope of IRC+10216 from milli-arcsecond to arcmin scales
title_sort	circumstellar envelope of irc+10216 from milli-arcsecond to arcmin scales
publisher	Astronomy & Astrophysics
publishDate	2020
url	https://repositorio.ufrn.br/jspui/handle/123456789/28886 https://doi.org/10.1051/0004-6361:20054577
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The circumstellar envelope of IRC+10216 from milli-arcsecond to arcmin scales

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