Precision astrometry of a sample of speckle binaries and multiples with the adaptive optics facilities at the Hale and Keck II telescopes

K. G. Hełminiak, M. Konacki, S. R. Kulkarni, J. Eisner

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

Using the adaptive optics facilities at the 200-in Hale and 10-m Keck II, we observed in the near-infrared a sample of 12 binary and multiple stars and one open cluster. We used the near diffraction limited images of these systems to measure the relative separations and position angles between their components. In this paper, we investigate and correct for the influence of the differential chromatic refraction and chip distortions on our relative astrometric measurements. Over one night, we achieve an astrometric precision typically well below 1 mas and occasionally as small as 40 μas. Such a precision is in principle sufficient to astrometrically detect planetary mass objects around the components of nearby binary and multiple stars. Since we have not had sufficiently large data sets for the observed sample of stars to detect planets, we provide the limits to planetary mass objects based on the obtained astrometric precision.

Original languageEnglish (US)
Pages (from-to)406-421
Number of pages16
JournalMonthly Notices of the Royal Astronomical Society
Volume400
Issue number1
DOIs
StatePublished - Nov 1 2009

Keywords

  • Astrometry
  • Binaries: Visual
  • Instrumentation: Adaptive optics
  • Planetary systems

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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