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 original | Inglés |
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Título de la publicación alojada | The Power of Optical/IR Interferometry |
Subtítulo de la publicación alojada | Recent Scientific Results and 2nd Generation Instrumentation: Proceedings of the ESO Workshop held in Garching, Germany, 4-8 April 2005 |
Editores | Andrea Richichi, Francoise Delplancke, Francesco Paresce, Alain Chelli |
Páginas | 111-115 |
Número de páginas | 5 |
DOI | |
Estado | Publicada - 2008 |
Publicado de forma externa | Sí |
Serie de la publicación
Nombre | ESO Astrophysics Symposia |
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Volumen | 2008 |
ISSN (versión impresa) | 1431-2433 |
ISSN (versión digital) | 1611-6143 |
Áreas temáticas de ASJC Scopus
- Astronomía y astrofísica
- Física y astronomía (miscelánea)