VISIR/VLT and VLA joint imaging analysis of the circumstellar nebula around IRAS 18576+0341
Journal
Date Issued
2010
Author(s)
Abstract
High spatial and sensitivity images of the Luminous Blue Variable IRAS 18576+0341 were obtained using the mid-infrared imager VISIR at the Very Large Telescope and the Very Large Array interferometer. The resultingmidinfrared continuum maps show a similar clumpy and approximately circular symmetric nebula, which contrasts sharply with the asymmetry that characterizes the ionized component of the envelope, as evidenced from the radio and [Ne II] line images obtained with comparable spatial resolution. In particular, there is excellent overall agreement between the 12.8 μm map and the radio images, consistent with free-free emission from circumstellar ionized material surrounding a central stellar wind. The color temperature and optical depth maps obtained from mid-infrared images show only slight fluctuations, suggesting quite uniform dust characteristics over the dust shell. We explore various possibilities to understand the cause of the different morphology of the dusty and gaseous component of the circumstellar envelope which are compatible with the observations. © 2010. The American Astronomical Society. All rights reserved.
Volume
721
Issue
2
Start page
1404
Issn Identifier
0004-637X
Ads BibCode
2010ApJ...721.1404B
Rights
open.access
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