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Title:
The Solar Neighborhood. XIII. Parallax Results from the CTIOPI 0.9 Meter Program: Stars with μ >= 1.0" yr-1 (MOTION Sample)
Authors:
Jao, Wei-Chun; Henry, Todd J.; Subasavage, John P.; Brown, Misty A.; Ianna, Philip A.; Bartlett, Jennifer L.; Costa, Edgardo; Méndez, René A.
Affiliation:
AA(Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30302-4106 ; Visiting Astronomer, Cerro Tololo Inter-American Observatory. CTIO is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under contract to the National Science Foundation (NSF). ), AB(Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30302-4106 ; Visiting Astronomer, Cerro Tololo Inter-American Observatory. CTIO is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under contract to the National Science Foundation (NSF). ), AC(Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30302-4106 ; Visiting Astronomer, Cerro Tololo Inter-American Observatory. CTIO is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under contract to the National Science Foundation (NSF). ), AD(Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30302-4106 ), AE(University of Virginia, Charlottesville, VA 22903; Visiting Astronomer, Cerro Tololo Inter-American Observatory. CTIO is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under contract to the National Science Foundation (NSF). ), AF(University of Virginia, Charlottesville, VA 22903 ), AG(Universidad de Chile, Santiago, Chile; Visiting Astronomer, Cerro Tololo Inter-American Observatory. CTIO is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under contract to the National Science Foundation (NSF). ), AH(Universidad de Chile, Santiago, Chile )
Publication:
The Astronomical Journal, Volume 129, Issue 4, pp. 1954-1967. (AJ Homepage)
Publication Date:
04/2005
Origin:
UCP
Astronomy Keywords:
Astrometry, Galaxy: Solar Neighborhood, Stars: Distances, Techniques: Photometric, Stars: White Dwarfs
DOI:
10.1086/428489
Bibliographic Code:
2005AJ....129.1954J

Abstract

We present the first set of definitive trigonometric parallaxes and proper motions from the Cerro Tololo Inter-American Observatory Parallax Investigation. Full astrometric reductions for the program are discussed, including methods of reference star selection, differential color refraction corrections, and conversion of relative to absolute parallax. Using data acquired at the 0.9 m telescope at CTIO, full astrometric solutions and VRIJHKs photometry are presented for 36 red and white dwarf stellar systems with proper motions faster than 1.0" yr-1. Of these, 33 systems have their first ever trigonometric parallaxes, which comprise 41% of MOTION systems (those reported to have proper motions greater than 1.0" yr-1) south of δ=0deg that have no parallaxes. Four of the systems are new members of the RECONS 10 pc sample for which the first accurate trigonometric parallaxes are published here: DENIS J1048-3956 (4.04+/-0.03 pc), GJ 1128 (LHS 271, 6.53+/-0.10 pc), GJ 1068 (LHS 22, 6.97+/-0.09 pc), and GJ 1123 (LHS 263, 9.02+/-0.16 pc). In addition, two red subdwarf-white dwarf pairs, LHS 193AB and LHS 300AB, are identified. The white dwarf secondaries fall in a previously uncharted region of the H-R diagram.

Associated Articles

Part 1     Part  2     Part  3     Part  4     Part  5     Part  6     Part  7     Part  8     Part  9     Part 10     Part 11     Part 12     Part 13     Part 14     Part 15     Part 16     Part 17     Part 18     Part 19     Part 20     Part 21     Part 22     Part 23    

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