Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2012-04-18
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
Accepted by The Astronomical Journal. 15 pages, 6 figures, 4 tables
Scientific paper
A subset of 51 Hipparcos astrometric binaries among FG dwarfs within 67pc has been surveyed with the NICI adaptive optics system at Gemini-S, directly resolving for the first time 17 sub-arcsecond 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.
Hartung Markus
Hayward Thomas L.
Makarov Valeri V.
Tokovinin Andrei
No associations
LandOfFree
Revealing companions to nearby stars with astrometric acceleration does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Revealing companions to nearby stars with astrometric acceleration, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Revealing companions to nearby stars with astrometric acceleration will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-33234