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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 421519.0, MPI für Astronomie / Publikationen_mpia
The circumstellar environment of evolved stars as seen by VLTI/MIDI
Authors:Ohnaka, K.; Bergeat, J.; Driebe, T.; Graser, U.; Hofmann, K. H.; Köhler, R.; Leinert, Ch; Lopez, B.; Malbet, F.; Morel, S.; Paresce, F.; Perrin, G.; Preibisch, Th; Richichi, A.; Schertl, D.; Schöller, M.; Sol, H.; Weigelt, G.; Wittkowski, M.
Place of Publication:Berlin
Date of Publication (YYYY-MM-DD):2008
Title of Proceedings:The Power of Optical/IR Interferometry: Recent Scientific Results and 2nd Generation Instrumentation
Start Page:111
End Page:115
Title of Series:ESO Astrophysics Symposia
Name of Conference/Meeting:The Power of Optical/IR Interferometry: Recent Scientific Results and 2nd Generation Instrumentation
Review Status:not specified
Audience:Experts Only
Abstract / Description:We present the results of the first mid-infrared interferometric observations of the Mira variable RRSco with the VLTI/MIDI, together with K-band observations using VLTI/VINCI.The uniform-disk diameter was found to be 18mas between 8 and 10mum, while it gradually increases at wavelengths longer than 10mum to reach 24mas at 13mum.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 10mum can be explained by an optically thin dust shell consisting of corundum and silicate grains.
Comment of the Author/Creator:Date: 2008, n/a 1, 2008
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISBN:978-3-540-74253-1 [ID No:1]
URL:http://adsabs.harvard.edu/abs/2008poii.conf..111O [ID No:2]
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