77 citations · 279 across the 5 of their papers we have counts for
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The Keele-Exeter young cluster survey: I. Low mass pre-main sequence stars in NGC 2169
R. D Jeffries, J. M. Oliveira, Tim Naylor +2
We have used R_C I_C CCD photometry from the Isaac Newton telescope and intermediate resolution spectroscopy from the Gemini North telescope to identify and characterise low-mass (…
Kinematic structure in the young Sigma Orionis association
R. D. Jeffries, P. F. L. Maxted, J. M. Oliveira +1
We have used precise radial velocity measurements for a large number of candidate low-mass stars and brown dwarfs, to show that the young Sigma Ori ``cluster'' consists of two spat…
Circumstellar discs in the young sigma Orionis cluster
J. M. Oliveira, R. D. Jeffries, J. Th. van Loon +1
We present new K- and L'-band imaging observations for members of the young (3-5 Myr) sigma Orionis cluster, obtained with UIST at UKIRT. We determine (K-L') colour excesses with r…