2 papers
astro-ph2004
Membership, binarity and accretion among very low-mass stars and brown dwarfs of the Sigma Orionis cluster
M. J. Kenyon, R. D. Jeffries, Tim Naylor +2
Intermediate resolution (R=7000) spectroscopy is presented for 76 photometrically selected very low mass (0.04<M<0.3M_{sun}) candidate members of the Sigma Orionis cluster. More th…
astro-ph2001
Low Mass Stars and Brown Dwarfs around Sigma Orionis
M. J. Kenyon, R. D. Jeffries, T. Naylor
We present optical spectroscopy of 71 photometric candidate low-mass members of the cluster associated with Sigma Orionis. Thirty-five of these are found to pass the lithium test a…