Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...490..835g&link_type=abstract
Astrophysical Journal v.490, p.835
Astronomy and Astrophysics
Astronomy
49
Astrometry, Techniques: Interferometric, Stars: Individual Constellation Name: Ab Doradus, Stars: Kinematics, Stars: Low-Mass, Brown Dwarfs
Scientific paper
We report submilliarcsecond-precise astrometric measurements for the late-type star AB Doradus via a combination of VLBI (very long baseline interferometry) and HIPPARCOS data. Our astrometric analysis results in the precise determination of the kinematics of this star, which reveals an orbital motion readily explained as caused by gravitational interaction with a low-mass companion. From the portion of the reflex orbit covered by our data and using a revised mass of the primary star (0.76 M&sun;) derived from our new value of the parallax (66.3 mas < pi < 67.2 mas), we find the dynamical mass of the newly discovered companion to be between 0.08 and 0.11 M&sun;. If accurate photometric information can be obtained for the low-mass companion, our precise mass estimate could serve as an accurate calibration point for different theoretical evolutionary models of low-mass objects. This represents the first detection of a low-mass stellar companion using VLBI, a technique that will become an important tool in future searches for planets and brown dwarfs orbiting other stars.
Arenou Frederic
Ferris Richard H.
Froeschle M. M.
Guirado Jose C.
Jauncey David L.
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