A New Pleiades Member at the Lithium Substellar Boundary

Details A New Pleiades Member at the Lithium Substellar Boundary A New Pleiades Member at the Lithium Substellar Boundary

1998-03-19

arxiv.org/abs/physics/9803026v1

Physics

Space Physics

17 pages, 3 figures

Scientific paper

10.1086/311350

We present the discovery of an object in the Pleiades open cluster, named Teide 2, with optical and infrared photometry which place 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 H$_\alpha$ in emission and Li I 670.8 nm in absorption. All the observed properties strongly support the membership of Teide 2 into 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 absence or presence of lithium is constrained to be in the range 100--120 Myr.

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