The solar neighborhood. XIV. Parallaxes from the Cerro Tololo inter-american observatory parallax investigation—first results from the 1.5 m telescope program
Author
dc.contributor.author
Costa Hechenleitner, Edgardo
Author
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Méndez Bussard, René Alejandro
es_CL
Author
dc.contributor.author
Jao, W. C.
es_CL
Author
dc.contributor.author
Henry, Todd J.
es_CL
Author
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Subasavage, John P.
es_CL
Author
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Brown, Misty A.
es_CL
Author
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Ianna, Philip A.
es_CL
Author
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Bartlett, Jennifer
es_CL
Admission date
dc.date.accessioned
2013-12-30T20:35:34Z
Available date
dc.date.available
2013-12-30T20:35:34Z
Publication date
dc.date.issued
2005
Cita de ítem
dc.identifier.citation
The Astronomical Journal, 130:337–349, 2005 July
en_US
Identifier
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https://repositorio.uchile.cl/handle/2250/125923
Abstract
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Trigonometric parallaxes, proper motions, and VJ (RI )KC photometry are presented for 31 stars targeted by the
Cerro Tololo Inter-American Observatory Parallax Investigation (CTIOPI ), a program of wide scope aimed at
discovering and characterizing nearby stars. The data given are the first that have been obtained with the CTIO 1.5 m
telescope, targeting a fainter subset of the CTIOPI input list. We present the first trigonometric parallaxes for 21
systems, of which one is within 10 pc (LP 647-013 at 9:59 0:22 pc) and six are between 10 and 25 pc. Concurrently
with our Cerro Tololo 0.9 m program, we have determined parallaxes for DEN 1048 3956 and LTT 6933
that place them at 4:00 0:03 and 16:24 0:43 pc from the Sun, respectively. We also present an improved
parallax for the important nearby triple system GJ 2005ABC, placing it at 7:72 0:15 pc from the Sun. The
remaining seven parallaxes are for calibration stars, whose values indicate that our results agree well with other
parallax determinations. We present color-magnitude and color-color diagrams that, in combination with theoretical
isochrones from the literature and other derived properties of the observed sample, have aided the identification
of the general nature of each of our targets.We have in this way discovered five new subdwarfs and several
very low mass stars, a few of which may be brown dwarfs.
The solar neighborhood. XIV. Parallaxes from the Cerro Tololo inter-american observatory parallax investigation—first results from the 1.5 m telescope program