The circumstellar environment of evolved stars as seen by VLTI/MIDI

K. Ohnaka, J. Bergeat, T. Driebe, U. Graser, K. H. Hofmann, R. Köhler, Ch Leinert, B. Lopez, F. Malbet, S. Morel, F. Paresce, G. Perrin, Th Preibisch, A. Richichi, D. Schertl, M. Schöller, H. Sol, G. Weigelt, M. Wittkowski

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Resumen

We present the results of the first mid-infrared interferometric observations of the Mira variable RR Sco with the VLTI/MIDI, together with K-band observations using VLTI/VINCI.The uniform-disk diameter was found to be 18mas between 8 and 10 μm, while it gradually increases at wavelengths longer than 10 μm to reach 24 mas at 13 μm. These uniform-disk diameters in the mid-infrared are significantly larger than the K-band uniform-disk diameter of 10.2±0.5 mas measured using VLTI/VINCI, three weeks after the MIDI observations. Our model calculations show that optically thick emission from a warm molecular envelope consisting of H2O and SiO can cause the apparent mid-infrared diameter to be much larger than the continuum diameter, and this can explain the mid-infrared angular sizes roughly twice as large as that measured in the K band. The observed increase of the uniform-disk diameter longward of 10 μm can be explained by an optically thin dust shell consisting of corundum and silicate grains.

Idioma originalInglés
Título de la publicación alojadaThe Power of Optical/IR Interferometry
Subtítulo de la publicación alojadaRecent Scientific Results and 2nd Generation Instrumentation: Proceedings of the ESO Workshop held in Garching, Germany, 4-8 April 2005
EditoresAndrea Richichi, Francoise Delplancke, Francesco Paresce, Alain Chelli
Páginas111-115
Número de páginas5
DOI
EstadoPublicada - 2008
Publicado de forma externa

Serie de la publicación

NombreESO Astrophysics Symposia
Volumen2008
ISSN (versión impresa)1431-2433
ISSN (versión digital)1611-6143

Áreas temáticas de ASJC Scopus

  • Astronomía y astrofísica
  • Física y astronomía (miscelánea)

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