CCD Parallaxes for 309 Late-type Dwarfs and Subdwarfs
CCD Parallaxes for 309 Late-type Dwarfs and Subdwarfs
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309 晚型矮星和亚矮星的 CCD 视差
DOI：
10.3847/1538-3881/aa880b
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Flagstaff Station L
中科院分区：
文献类型：
--
作者：
C. Dahn;H. Harris;J. Subasavage;H. Ables;B. Canzian;H. Guetter;F. Harris;A. Henden;S. Leggett;S. Levine;C. Luginbuhl;A. B. Monet;D. Monet;J. Munn;J. Pier;R. Stone;F. Vrba;R. L. Walker;Trudy M. Tilleman US Naval Observatory;Flagstaff Station L
新的，更新的，和/或修订的CCD视差确定与斯特兰德天体测量反射在海军天文台弗拉格斯塔夫站。其中包括309晚型矮星和亚矮星的结果，这些恒星是在该计划运行的30多年里观测到的。对于124颗恒星，其他研究人员的视差测定已经出现在文献中，我们比较了不同的结果。这里还包括新的或更新的VI测光的约翰逊-克朗-托宁斯系统的所有，但少数最微弱的目标。结合2 MASS JHK的近红外测光，构造了绝对星等-颜色图和颜色-颜色图。因为大的自行是选择恒星的主要标准，所以大多数都是M型次矮星或晚M型矮星。该样本还包括50颗矮星或亚矮星L型恒星和4颗T型矮星。根据切向速度、次光度和光谱类型，在样本中确定了可能的晕次矮星。几颗恒星的视差解和自行解的残差显示了天体测量扰动的证据。
New, updated, and/or revised CCD parallaxes determined with the Strand Astrometric Reflector at the Naval Observatory Flagstaff Station are presented. Included are results for 309 late-type dwarf and subdwarf stars observed over the 30+ years that the program operated. For 124 of the stars, parallax determinations from other investigators have already appeared in the literature and we compare the different results. Also included here are new or updated VI photometry on the Johnson–Kron-Cousins system for all but a few of the faintest targets. Together with 2MASS JHKs near-infrared photometry, a sample of absolute magnitude versus color and color versus color diagrams are constructed. Because large proper motion was a prime criterion for targeting the stars, the majority turn out to be either M-type subdwarfs or late M-type dwarfs. The sample also includes 50 dwarf or subdwarf L-type stars, and four T dwarfs. Possible halo subdwarfs are identified in the sample based on tangential velocity, subluminosity, and spectral type. Residuals from the solutions for parallax and proper motion for several stars show evidence of astrometric perturbations.
拟议的绕 VB 10 运行的巨行星并不存在
DOI：
10.1088/2041-8205/711/1/l19
发表时间：
2010
期刊：
The Astrophysical Journal Letters
影响因子：
--
作者：
Jacob L;Seifahrt;Andreas;Hartman;Henrik;Nilsson;Hampus;Reiners;Ansgar;Dreizler;Stefan;Todd J;Wiedemann;Günter
通讯作者：
Günter