Hełminiak, K. G. and Konacki, M. and Kulkarni, S. R. and Eisner, J. (2009) Precision astrometry of a sample of speckle binaries and multiples with the adaptive optics facilities at the Hale and Keck II telescopes. Monthly Notices of the Royal Astronomical Society, 400 (1). pp. 406-421. ISSN 0035-8711 http://resolver.caltech.edu/CaltechAUTHORS:20100112-113739245
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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 1mas 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.
|Additional Information:||© 2009 The Authors. Journal compilation © 2009 RAS. Accepted 2009 July 28. Received 2009 July 27; in original form 2009 March 16. Published Online: 22 Sep 2009. MK is supported by the Foundation for Polish Science through a FOCUS grant and fellowship. This work was supported by the Polish Ministry of Science and Higher Education through grants N203 005 32/0449 and 1P03D-021-29, and by NASA through grant NNG04GM62G. This publication made use of data products from the Two-Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis centre California Institute of Technology, funded by the NASA and the National Science Foundation.|
|Subject Keywords:||instrumentation: adaptive optics, astrometry, binaries: visual, planetary systems|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||25 Jan 2010 23:21|
|Last Modified:||26 Dec 2012 11:41|
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