2015A&A...583A.106R -
Astronomy and Astrophysics, volume 583A, 106-106 (2015/11-1)
Modelling the atmosphere of the carbon-rich Mira RU Virginis.
RAU G., PALADINI C., HRON J., ARINGER B., GROENEWEGEN M.A.T. and NOWOTNY W.
Abstract (from CDS):
We study the atmosphere of the carbon-rich Mira
RU Vir using the mid-infrared high spatial resolution interferometric observations from VLTI/MIDI. The aim of this work is to analyse the atmosphere of the carbon-rich Mira RU Vir with hydrostatic and dynamic models, in this way deepening the knowledge of the dynamic processes at work in carbon-rich Miras. We compare spectro-photometric and interferometric measurements of this carbon-rich Mira AGB star with the predictions of different kinds of modelling approaches (hydrostatic model atmospheres plus MOD-More Of Dusty, self-consistent dynamic model atmospheres). A geometric model fitting tool is used for a first interpretation of the interferometric data. The results show that a joint use of different kinds of observations (photometry, spectroscopy, interferometry) is essential for shedding light on the structure of the atmosphere of a carbon-rich Mira. The dynamic model atmospheres fit the ISO spectrum well in the wavelength range λ=[2.9, 25.0]µm. Nevertheless, a discrepancy is noticeable both in the SED (visible) and in the interferometric visibilities (shape and level), which is a possible explanation are intra-/inter-cycle variations in the dynamic model atmospheres, as well as in the observations. The presence of a companion star and/or a disk or a decrease in mass loss within the past few hundred years cannot be excluded, but these explanations are considered unlikely.
Abstract Copyright:
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Journal keyword(s):
techniques: interferometric - instrumentation: high angular resolution - circumstellar matter - stars: atmospheres - stars: AGB and post-AGB - stars: fundamental parameters
Simbad objects:
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