The solar neighborhood. VII. Discovery and characterization of nearby multiples in the Ctio parallax investigation
Author
dc.contributor.author
Jao, Wei-Chun
Author
dc.contributor.author
Henry, Todd J.
es_CL
Author
dc.contributor.author
Subasavage, John P.
es_CL
Author
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Bean, Jacob L.
es_CL
Author
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Costa Hechenleitner, Edgardo
es_CL
Author
dc.contributor.author
Lanna, Philip A.
es_CL
Author
dc.contributor.author
Méndez Bussard, René Alejandro
es_CL
Admission date
dc.date.accessioned
2014-01-09T17:32:07Z
Available date
dc.date.available
2014-01-09T17:32:07Z
Publication date
dc.date.issued
2003-01
Cita de ítem
dc.identifier.citation
The Astronomical Journal, 125:332–342, 2003 January
en_US
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/126124
General note
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Artículo de publicación ISI.
en_US
Abstract
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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