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Dust scattering in the Miras R Car and RR Sco resolved by optical interferometric polarimetry

Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/136688

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Title: Dust scattering in the Miras R Car and RR Sco resolved by optical interferometric polarimetry
Related: Monthly notices of the Royal Astronomical Society, Vol. 361, No. 1, (2005), p.337-344
DOI: 10.1111/j.1365-2966.2005.09181.x
Publisher: Wiley
Date: 2005
Author/Creator: Ireland, M. J
Author/Creator: Tuthill, P. G
Author/Creator: Davis, J
Author/Creator: Tango, W
Description: We present optical interferometric polarimetry measurements of the Mira-like variables R Car and RR Sco, using the Sydney University Stellar Interferometer. By making visibility measurements in two perpendicular polarizations, the relatively low-surface brightness light scattered by atmospheric dust could be spatially separated from the bright Mira photospheric flux. This is the first reported successful use of long-baseline optical interferometric polarimetry. Observations were able to place constraints on the distribution of circumstellar material in R Car and RR Sco. The inner radius of dust formation for both stars was found to be less than 3 stellar radii: much closer than the expected innermost stable location for commonly assumed astrophysical 'dirty silicate' dust in these systems (silicate dust with a significant iron content). A model with the dust distributed over a shell which is geometrically thin compared to the stellar radius was preferred over an outflow. We propose dust components whose chemistry and opacity properties enable survival at these extreme inner radii.
Description: 8 page(s)
Subject Keyword: Stars: AGB and post-AGB
Subject Keyword: Stars: variables: other
Subject Keyword: Techniques: interferometric
Resource Type: journal article
Organisation: Macquarie University. Dept. of Physics and Astronomy

Identifier: http://hdl.handle.net/1959.14/136688
Identifier: ISSN:0035-8711
Identifier: mq_res-ext-2-s2.0-22944461086
Language: eng
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