SETI bioastro: Disks around young stars with VLTI/MIDI

From: LARRY KLAES (ljk4_at_msn.com)
Date: Wed Jul 19 2006 - 06:22:23 PDT

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    Paper: astro-ph/0607387
    Date: Mon, 17 Jul 2006 15:38:52 GMT (960kb)

    Title: Disks around young stars with VLTI/MIDI

    Authors: Roy van Boekel, Peter Abraham, Serge Correia, Alex de Koter,
    Carsten
    Dominik, Anne Dutrey, Thomas Henning, Agnes Kospal, Regis Lachaume,
    Christoph
    Leinert, Hendrik Linz, Michiel Min, Laszlo Mosoni, Thomas Preibisch, Sascha
    Quanz, Thorsten Ratzka, Alexander Schegerer, Rens Waters, Sebastian Wolf,
    and
    Hans Zinnecker

    Comments: 19 pages, 12 figures, invited talk at SPIE conference
    "Astronomical
    telescopes and instrumentation", Orlando, may 2006
    \\
    We report on observations of circumstellar disks around young stars that
    have
    been obtained with the MIDI instrument, which is mounted on the VLT
    Interferometer and operates in the 10 micrometer atmospheric window. The
    maximum spatial resolution of 5 milli-arcsec corresponds to sub-AU scales at
    the distance to nearby star formation regions. Thus, we can study the disks
    on
    the spatial scales at which important processes occur, such as accretion,
    dust
    processing, and planet formation. The main results obtained so far can be
    summarized as follows: 1. The measured interferometric visibilities are in
    good
    qualitative agreement with those predicted by models of circumstellar disks.
    In
    particular, a predicted correlation between the strength of the far-infrared
    excess and the spatial structure of the disk is confirmed by direct
    measurements; 2. In several objects strong evidence for deviations from
    circular symmetry is present, indicating that an inclined disk is indeed the
    dominant component seen in the mid-infrared; 3. The dust properties are not
    uniform over the disk, but are instead a strong function of distance to the
    central star. The dust in the innermost disk regions is observed to be more
    ``processed'' than the dust further out, both in Herbig Ae star disks and in
    those around T-Tauri stars.

    \\ ( http://arXiv.org/abs/astro-ph/0607387 , 960kb)


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