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Title:
The Solar Neighborhood. VII. Discovery and Characterization of Nearby Multiples in the CTIO Parallax Investigation
Authors:
Jao, Wei-Chun; Henry, Todd J.; Subasavage, John P.; Bean, Jacob L.; Costa, Edgardo; Ianna, Philip A.; Méndez, René A.
Affiliation:
AA(Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30303-3083 ; Visiting Astronomer, Cerro Tololo Inter-American Observatory. CTIO is operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the National Science Foundation. ), AB(Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30303-3083 ; Visiting Astronomer, Cerro Tololo Inter-American Observatory. CTIO is operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the National Science Foundation. ), AC(Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30303-3083 ), AD(School of Physics, Georgia Institute of Technology, Atlanta, GA 30332-0430 ), AE(Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile ), AF(Department of Astronomy, University of Virginia, Charlottesville, VA 22903-0818 ), AG(European Southern Observatory, Casilla 19001, Santiago 19, Chile )
Publication:
The Astronomical Journal, Volume 125, Issue 1, pp. 332-342. (AJ Homepage)
Publication Date:
01/2003
Origin:
UCP
Astronomy Keywords:
Astrometry, Stars: Binaries: Close, Stars: Low-Mass, Brown Dwarfs, Stars: Statistics, Stars: Variables: Other, Surveys
DOI:
10.1086/345515
Bibliographic Code:
2003AJ....125..332J

Abstract

We report the discovery of eight new multiple star systems among 191 stellar systems targeted for parallax determinations in the RECONS (Research Consortium on Nearby Stars) southern parallax program, CTIOPI (Cerro Tololo Inter-American Observatory Parallax Investigation). The eight new companions have separations of 1.42" to 14.90" and instrumental magnitude differences at VRI of 0.06-6.07 mag. Orbital motion has not been detected in any of these systems. These new companions increase the multiplicity fraction of this sample, made up primarily of nearby (less than 25 pc) M dwarfs, to 15%. Comparison with samples that have been more completely scrutinized for companions indicates that probably only half of all multiples have so far been discovered. Given the large number of frames acquired for the astrometric series, the eight new systems and 16 known multiples have been searched for variability at VRI during the 3 year duration of CTIOPI. A flare has been detected in the secondary of the RX J1132-264 system, while at least one component in the GJ 2006 system is a probable long-term variable. Variables were detected in only 9% of the systems searched, primarily as a result of the restrictive 0.05 mag threshold required for variability confirmation.

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