Astrometric Indications of Brown Dwarfs based on HIPPARCOS Data

Details Astrometric Indications of Brown Dwarfs based on HIPPARCOS Data Astrometric Indications of Brown Dwarfs based on HIPPARCOS Data

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..705b&link_type=abstract

In: B. Battrick, M.A.C. Perryman and P.L. Bernacca (eds.): HIPPARCOS '97. Presentation of the Hipparcos and Tycho catalogues and

Astronomy and Astrophysics

Astrophysics

13

Scientific paper

In order to investigate the standard star solutions of the astrometric parameter determination in the FAST consortium, I developed an algorithm for the detection of astrometric binaries. The application of this algorithm was concentrated on those objects, where the chi^2-test of the astrometric parameter estimation using a single star model was not satisfactory. This method will be outlined in this paper. It is shown, that the accuracy of the Hipparcos observations allows the detection of brown dwarfs as a component of an astrometric binary. A systematic search of low mass companions among the M and K stars in the solar neighbourhood delivered six candidates possibly orbited by a brown dwarf, including Gliese 433.

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