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HUBBLE SPACE TELESCOPE OBSERVATIONS OF THE VERY LOW MASS COMPANION TO GLIESE 105A

机译:质量很低的同伴105A的哈勃太空望远镜观测

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摘要

Hubble Space Telescope images of the astrometric binary Gl 105A confirm the previous ground-based detection of a faint, very red companion (Gl 105C) located 3.39″ from Gl 105A at P. A. 290°. The instrumental magnitudes of Gl 105C are V_(555) = 16.86 and I_(814) = 13.54. The observed position of Gl 105C differs significantly from the positions expected from current astrometric solutions. No other companions brighter than I_(814) = 20.3 are seen between 1″ and 13.5″ from Gl 105A. Using the M dwarf model atmospheres of Allard and Hauschildt, we obtain for Gl 105C a standard color of V-I = 4.6, which suggests a spectral type of M7 V.
机译:天文双星Gl 105A的哈勃太空望远镜影像证实了先前的地面探测,发现它位于距离P. A. 290°距离Gl 105A 3.39英寸处的微弱,非常红的伴侣(Gl 105C)。 G1 105C的仪器大小为V_(555)= 16.86和I_(814)= 13.54。 G1 105C的观测位置与当前天文解法所预期的位置明显不同。在G1 105A的1″和13.5″之间没有看到比I_(814)= 20.3更亮的其他同伴。使用Allard和Hauschildt的M矮模型大气,我们为Gl 105C获得了V-1 = 4.6的标准颜色,这表明光谱类型为M7V。

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