F Derie

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Deriving unambiguously the orbital parameters and masses of extrasolar planets requires at least 2-dimensional information on either the positions or motions of the planet directly (currently out of reach) or, indirectly, of the host star. The latter can be done with high-precision astrometry at the 10 microarcsec level. To achieve this goal, a consortium(More)
  • G Daigne, F Delplancke, F Arenou, F Derie, P Dierich, M Odenkirchen +2 others
  • 2007
We propose a near-IR demonstration experiment with the two VLTI test siderostats (0.4 m) at Paranal, to be used both in wide-angle single-eld and in narrow-angle dual-eld astrometry. The speciications required to operate an astrometric interferometer are particularly stringent on siderostat rotation axes, pupil transfer and instrument stability. These(More)
A study was made of the social consequences of communicative disorders among 51 elderly hospitalized long-term patients. Independent variables used to account for variations in social behavior were: 1) the presence or absence of aphasia, an impairment resulting in varying degrees of loss of verbal recognition, comprehension and language production; 2) sex;(More)
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