The Solar Neighborhood. XVII. Parallax Results from the CTIOPI 0.9 m Program: 20 New Members of the RECONS 10 Parsec Sample
The Solar Neighborhood. XVII. Parallax Results from the CTIOPI 0.9 m Program: 20 New Members of the RECONS 10 Parsec Sample
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DOI：
10.1086/508233
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发表时间：
2006-08
期刊：
影响因子：
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通讯作者：
T. Henry;W. Jao;J. Subasavage;T. Beaulieu;P. Ianna;E. Costa;R. Mendez
中科院分区：
文献类型：
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作者：
T. Henry;W. Jao;J. Subasavage;T. Beaulieu;P. Ianna;E. Costa;R. Mendez
提出了25个红色矮人系统的星体测量，包括在太阳10 pc中的20个系统的第一个确定的三角平行，这是重新构成样品的地平线。 ）为0253+1652（3.84±0.04 PC，第23个最近的系统），SCR 1845-6357 AB（3.85±0.02 PC，24th最接近的）和LHS 1723（5.32±0.04 PC，最接近56个）。完整的Vrijhks光度法和光谱类型。在V频段中，GJ 54 AB和GJ 1061的平行率提高了1.7个磁头。 ABC据报道所有这些都在10 pc之内，表明它们超过了10个PC。自2000年以来，误差超过10个MAS的误差不足以包含在重置样本中恒星系统的净净增加16％，可靠地已知比10 PC。
Astrometric measurements for 25 red dwarf systems are presented, including the first definitive trigonometric parallaxes for 20 systems within 10 pc of the Sun, the horizon of the RECONS sample. The three nearest systems that had no previous trigonometric parallaxes (other than perhaps rough preliminary efforts) are SO 0253+1652 (3.84 ± 0.04 pc, the 23rd nearest system), SCR 1845-6357 AB (3.85 ± 0.02 pc, 24th nearest), and LHS 1723 (5.32 ± 0.04 pc, 56th nearest). In total, seven of the systems reported here rank among the nearest 100 stellar systems. Supporting photometric and spectroscopic observations have been made to provide full characterization of the systems, including complete VRIJHKs photometry and spectral types. A study of the variability of 27 targets reveals six obvious variable stars, including GJ 1207, for which we observed a flare event in the V band that caused it to brighten by 1.7 mag. Improved parallaxes for GJ 54 AB and GJ 1061, both important members of the 10 pc sample, are also reported. Definitive parallaxes for GJ 1001 A, GJ 633, and GJ 2130 ABC, all of which have been reported to be within 10 pc, indicate that they are beyond 10 pc. From the analysis of systems with (previously) high trigonometric parallax errors, we conclude that parallaxes with errors in excess of 10 mas are insufficiently reliable for inclusion in the RECONS sample. The cumulative total of new additions to the 10 pc sample since 2000 is now 34 systems: 28 by the RECONS team and six by other groups. This total represents a net increase of 16% in the number of stellar systems reliably known to be nearer than 10 pc.