Compact circumstellar disk in a post-Agb Star OH 231.8+4.2

Matsuura, M. ORCID: https://orcid.org/0000-0002-5529-5593 2007. Compact circumstellar disk in a post-Agb Star OH 231.8+4.2. BALTIC ASTRONOMY 16 (1) , pp. 87-91.

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Abstract

We have observed a bipolar post-AGB star OH 231.8+4.2, using the mid-infrared interferometer MIDI and the infrared camera with an adaptive optics system NACO on VLT. An unresolved core (<200 mas in FWHM), found at the center of the OH 231.8+4.2 in the 3.8 μ m image, is resolved with the interferometer. The fringes from the four baselines consistently show the presence of a compact circumstellar shell with an inner radius of 30--40 mas, which is equivalent to 40--50 AU at 1.3 kpc. The measured size of the circumstellar feature is consistent with the size of disks calculated by hydrodynamic models, implying the circumstellar feature may have a disk configuration. The mid-infrared size of the circumstellar dust shell or disk among AGB and post-AGB stars seems to be correlated with the effective temperature of the central star....

Item Type:	Article
Status:	Published
Schools:	Physics and Astronomy
Publisher:	INST THEORETICAL PHYSICS ASTRO
ISSN:	1392-0049
Related URLs:	Publisher
Last Modified:	15 May 2024 15:00
URI:	https://orca.cardiff.ac.uk/id/eprint/168089

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