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| HAL: hal-00003365, version 1 |
| arXiv: astro-ph/0411735 |
| Detailed view |  Export this paper |
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| Astronomy and Astrophysics 428 (2004) 13-16 |
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| First detection of dust clouds around R CrB variable stars |
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| Patrick De Laverny 1Djamel Mékarnia 1 |
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| (2004) |
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| From VLT/NACO diffraction-limited images of RY~Sgr, we report the first direct detection of heterogeneities in the circumstellar envelope of a R Coronae Borealis variable star. Several bright and very large dust clouds are seen in various directions at several hundred stellar radii from RY Sgr, revealing high activity for the ejection of stellar material by R CrB variables. These observations do support the current interpretation that optically thick dust clouds are formed around the surface of this type of variable stars and, when passing between the star and the observer, produce the huge and sudden declines characterizing these objects in visible light. This is the first direct confirmation of a scenario proposed about 70 years ago. |
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| 1: | Laboratoire de Cosmologie, Astrophysique Stellaire & Solaire, de Planétologie et de Mécanique des Fluides (CASSIOPEE) |
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Université de Nice Sophia Antipolis (UNS) – CNRS : UMR6202 – Observatoire de la Cote d'Azur – INSU |
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| Subject | : | Sciences of the Universe/Astrophysics Physics/Astrophysics/Cosmology and Extra-Galactic Astrophysics |
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| AGB and post-AGB stars: variables stars – RY Sgr – mass-loss – circumstellar matter – high angular resolution |
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| hal-00003365, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00003365 | |
| oai:hal.archives-ouvertes.fr:hal-00003365 | |
| From: Eric Lagadec | |
| Submitted on: Friday, 26 November 2004 18:09:45 | |
| Updated on: Friday, 26 November 2004 21:12:16 | |
