SIMBAD references

2012AJ....144....7T - Astron. J., 144, 7 (2012/July-0)

Revealing companions to nearby stars with astrometric acceleration.


Abstract (from CDS):

A subset of 51 Hipparcos astrometric binaries among FG dwarfs within 67 pc has been surveyed with the Near-Infrared Coronagraphic Imager adaptive optics system at Gemini-S, directly resolving for the first time 17 subarcsecond companions and 7 wider ones. Using these data together with published speckle interferometry of 57 stars, we compare the statistics of resolved astrometric companions with those of a simulated binary population. The fraction of resolved companions is slightly lower than expected from binary statistics. About 10% of astrometric companions could be "dark" (white dwarfs and close pairs of late M-dwarfs). To our surprise, several binaries are found with companions too wide to explain the acceleration. Re-analysis of selected intermediate astrometric data shows that some acceleration solutions in the original Hipparcos catalog are spurious.

Abstract Copyright:

Journal keyword(s): binaries: general

VizieR on-line data: <Available at CDS (J/AJ/144/7): table1.dat table2.dat table4.dat notes.dat>

Simbad objects: 120

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