A New Pleiades Member at the Lithium Substellar Boundary
A New Pleiades Member at the Lithium Substellar Boundary
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锂亚恒星边界的昴宿星团新成员
DOI：
10.1086/311350
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
V. Béjar
中科院分区：
文献类型：
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作者：
E. L. Martín;G. Basri;J. Gallegos;R. Rebolo;M. Zapatero;V. Béjar
我们在昴宿星团疏散星团中发现了一个天体，命名为Teide 2，通过光学和红外光度测定，它在星团序列上的位置略低于预期的次恒星质量极限。我们已经获得了低分辨率和高分辨率的光谱，使我们能够确定其光谱类型（M6），径向速度和旋转展宽，并检测发射中的Hα和吸收中的Li I。所有观测到的性质都有力地支持泰德2是昴星团的成员。这个天体在确定昴宿星团中低于恒星极限的锂的重新出现方面起着重要作用。昴星团质量非常低的成员的年龄，基于它们的光度和锂的存在与否，被限制在100-120兆尔的范围内。
We present the discovery of an object in the Pleiades open cluster, named Teide 2, with optical and infrared photometry that places it on the cluster sequence slightly below the expected substellar mass limit. We have obtained low- and high-resolution spectra that allow us to determine its spectral type (M6), radial velocity, and rotational broadening and to detect Hα in emission and Li I in absorption. All the observed properties strongly support the membership of Teide 2 in the Pleiades. This object has an important role in defining the reappearance of lithium below the substellar limit in the Pleiades. The age of the Pleiades' very low mass members, based on their luminosities and the absence or presence of lithium, is constrained to be in the range 100-120 Myr.