DH Tauri 一颗年轻棕矮星伴星
天体物理学
2009-11-10 v1
摘要
我们报告了对DH Tauri这颗经典T Tauri星的年轻棕矮星伴星DH Tau B的检测结果。利用Subaru望远镜上的CIAA协同望远镜进行的近红外观测，发现DH Tau B的H波段亮度约为~15 mag，位于DH Tau A主星2.3"（330 AU）外。将其位置与哈勃太空站档案影像进行比较，确认DH Tau A和B共享相同的适度运动，表明它们是物理上相互关联的天体。DH Tau B的近红外颜色与年轻恒星对象相符。其近红外光谱显示深入的水污 absorption 带、强烈的K I吸收线以及适度的Na I吸收线。通过将观测到的光谱与低质量天体的综合光谱进行比较，我们推导出DH Tau B的有效温度为2700--2800 K，表面重力为log g = 4.0--4.5。根据其在HR图上的位置，DH Tau B的质量为30--50 M_Jupiter。
引用
@article{arxiv.astro-ph/0411177,
title = {A Young Brown Dwarf Companion to DH Tauri},
author = {Yoichi Itoh and Masahiko Hayashi and Motohide Tamura and Takashi Tsuji and Yumiko Oasa and Misato Fukagawa and Saeko S. Hayashi and Takahiro Naoi and Miki Ishii and Satoshi Mayama and Jun-ichi Morino and Takuya Yamashita and Tae-Soo Pyo and Takayuki Nishikawa and Tomonori Usuda and Koji Murakawa and Hiroshi Suto and Shin Oya and Naruhisa Takato and Hiroyasu Ando and Shoken M. Miyama and Naoto Kobayashi and Norio Kaifu},
journal= {arXiv preprint arXiv:astro-ph/0411177},
year = {2009}
}
备注
10 pages, 14 figures, 1 table, accepted for publication in ApJ