TRIGONOMETRIC PARALLAXES AND PROPER MOTIONS OF 134 SOUTHERN LATE M, L, AND T DWARFS FROM THE CARNEGIE ASTROMETRIC PLANET SEARCH PROGRAM

被引：43
|
作者：
Weinberger, Alycia J. [1 ]
Boss, Alan P. [1 ]
Keiser, Sandra A. [1 ]
Anglada-Escude, Guillem [2 ]
Thompson, Ian B. [3 ]
Burley, Gregory [4 ]
机构：
[1] Carnegie Inst Sci, Dept Terr Magnetism, 5241 Broad Branch Rd, Washington, DC 20015 USA
[2] Queen Mary Univ London, Sch Phys & Astron, 327 Mile End Rd, London E1 4NS, England
[3] Carnegie Inst Sci, Carnegie Observ, 813 Santa Barbara St, Pasadena, CA 91101 USA
[4] Natl Res Council Canada, 5071 West Saanich Rd, Victoria, BC V9E 2E7, Canada
来源：
ASTRONOMICAL JOURNAL | 2016年 / 152卷 / 01期
基金：
美国国家科学基金会; 美国国家航空航天局;
关键词：
astrometry; brown dwarfs; stars; low-mass; LOW-MASS STARS; NAVAL OBSERVATORY PARALLAXES; M TELESCOPE PROGRAM; BINARY BROWN DWARF; ULTRACOOL DWARFS; SOLAR NEIGHBORHOOD; COOL NEIGHBORS; MAIN-SEQUENCE; NEARBY STARS; SKY SURVEY;
D O I：
10.3847/0004-6256/152/1/24
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We report trigonometric parallaxes for 134 low-mass stars and brown dwarfs, of which 38 have no previously published measurement and 79 more have improved uncertainties. Our survey focused on nearby targets, so 119 are closer than 30 pc. Of the 38 stars with new parallaxes, 14 are within 20 pc and seven are likely brown dwarfs (spectral types later than L0). These parallaxes are useful for studies of kinematics, multiplicity, and spectrophotometric calibration. Two objects with new parallaxes are confirmed as young stars with membership in nearby young moving groups: LP 870-65 in AB Doradus and G 161-71 in Argus. We also report the first parallax for the planet-hosting star GJ 3470; this allows us to refine the density of its Neptune-mass planet. T-dwarf 2MASS J12590470-4336243, previously thought to lie within 4 pc, is found to be at 7.8 pc, and the M-type star 2MASS J01392170-3936088 joins the ranks of nearby stars as it is found to be within 10 pc. Five stars that are overluminous and/or too red for their spectral types are identified and deserve further study as possible young stars.
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页数：8
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