NGC 6994 { clearly not a physical stellar ensemble ?

@article{Odenkirchen2002NGC6,
  title={NGC 6994 \{ clearly not a physical stellar ensemble ?},
  author={Michael Odenkirchen and C. Soubiran},
  journal={Astronomy and Astrophysics},
  year={2002},
  volume={383},
  pages={163-170}
}
The sparse stellar ensemble NGC 6994 = M 73 has recently been discussed as a possible remnant of an old open cluster. In order to solve the controversy regarding the nature of this object we have taken high- resolution spectra of the six brightest stars within 6 0 angular distance of its nominal position. These stars are the only obvious candidate members of an eventual cluster or cluster remnant since fainter stars do not show any signicant concentration in the plane of the sky. The radial… 

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