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High spatial resolution observations of OH 231.8+4.2

  • M. Matsuura (a1) (a2) (a3), O. Chesneau (a4), A. A. Zijlstra (a1), W. Jaffe (a5), L. B. F. M. Waters (a6) (a7), J. A. Yates (a8), E. Lagadec (a1) and T. M. Gledhill (a9)...

Abstract

We have observed the bipolar post-AGB candidate OH 231.8+4.2, using the mid-infrared interferometer MIDI and the infrared camera with the adaptive optics system NACO on the Very Large Telescope. The NACO images at 2.12 and 3.8 $\mu$m show a bipolar outflow and a flared disk or torus. An unresolved core ($<$200 mas in FWHM) is found at the centre of OH 231.8+4.2 in the 3.8 $\mu$m image. This compact source is resolved with the interferometer. The fringes from the four baselines consistently show the presence of a compact circumstellar material with an inner radius of 30–40 mas, which is equivalent to 40–50 AU at 1.3 kpc. This clearly shows that the mid-infrared compact source is not the central star (3 AU) but circumstellar material.

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High spatial resolution observations of OH 231.8+4.2

  • M. Matsuura (a1) (a2) (a3), O. Chesneau (a4), A. A. Zijlstra (a1), W. Jaffe (a5), L. B. F. M. Waters (a6) (a7), J. A. Yates (a8), E. Lagadec (a1) and T. M. Gledhill (a9)...

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