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1 results

  • High spatial resolution observations of OH 231.8+4.2

  • M. Matsuura, O. Chesneau, A. A. Zijlstra, W. Jaffe, L. B. F. M. Waters, J. A. Yates, E. Lagadec, T. M. Gledhill
  • Journal:
    Proceedings of the International Astronomical Union / Volume 2 / Issue S234 / April 2006
    Published online by Cambridge University Press:
    15 December 2006, pp. 457-458
    Print publication:
    April 2006
    • Article
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  • 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.