SIMBAD references

2002A&A...385..862S - Astronomy and Astrophysics, volume 385, 862-866 (2002/4-3)

Additional TWA members? Spectroscopic verification of kinematically selected TWA candidates.


Abstract (from CDS):

We present spectroscopic measurements of the 23 new candidate members of the TW Hydrae Association from Makarov & Fabricius (2001A&A...368..866M). Based on Hα and Li 6708Å strengths together with location on a color-magnitude diagram for Hipparcos TWA candidates, we found only three possible new members (TYC 7760-0835-1, TYC 8238-1462-1, and TYC 8234-2856-1) in addition to the already known member, TWA 19. This eliminated most of the candidates more distant than 100 pc. Three Tycho stars, almost certainly members of the Lower Centaurus Crux association, are the most distant members of the TWA. A claim of isotropic expansion of TWA has to be re-evaluated based on our new results. Generally, one cannot identify new members of a diffuse nearby stellar group based solely on kinematic data. To eliminate interlopers with similar kinematics, spectroscopic verification is essential.

Abstract Copyright:

Journal keyword(s): galaxy: open clusters and associations: individual: TWA - stars: kinematics - stars: planetary systems - techniques: spectroscopic

Nomenclature: Table 1: Song N (Nos 1-3).

CDS comments: The 3 last possible TWA members in table 1 (here designated as TYC 7760-0835-1, TYC 8238-1462-1, TYC 8234-2856-1) are designated as SONG 1, SONG 2, SONG 3, in 2003AN....324..516K

Simbad objects: 42

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