Membership, binarity and accretion among very low-mass stars and brown dwarfs of the σ Orionis cluster

@article{Kenyon2005MembershipBA,
  title={Membership, binarity and accretion among very low-mass stars and brown dwarfs of the $\sigma$ Orionis cluster},
  author={M. Kenyon and R. Jeffries and T. Naylor and J. Oliveira and P. Maxted},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2005},
  volume={356},
  pages={89-106}
}
Intermediate-resolution (R∼ 7000) spectroscopy is presented for 76 photometrically selected very low-mass (0.04 < M < 0.3 M⊙) candidate members of the young cluster around σ Orionis (σ Ori). More than two-thirds appear to be genuine cluster members on the basis that they exhibit Li i 6708-A absorption, weak Na i 8183/8195 A features and a radial velocity consistent with the cluster mean. Photometric selection alone therefore appears to be very effective in identifying cluster members in this… Expand
A survey for low-mass spectroscopic binary stars in the young clusters around σ Orionis and λ Orionis
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