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The low-mass Initial Mass Function in the young cluster NGC 6611
J. M. Oliveira, R. D. Jeffries, J. Th. van Loon
NGC 6611 is the massive young cluster (2-3 Myr) that ionises the Eagle Nebula. We present very deep photometric observations of the central region of NGC 6611 obtained with the Hub…
A survey for low mass spectroscopic binary stars in the young clusters around sigma Orionis and lambda Orionis
P. F. L. Maxted, R. D. Jeffries, J. M. Oliveira +2
We have obtained multi-epoch, high-resolution spectroscopy of 218 candidate low-mass stars and brown dwarfs in the young clusters around sigma Ori and lambda Ori. We find that 196…
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…
Circumstellar discs around solar-mass stars in NGC 6611
J. M. Oliveira, R. D. Jeffries, J. Th. van Loon +2
We have performed IZJHKL' observations in NGC 6611, the young cluster that ionises the Eagle Nebula. We have discovered a rich pre-main sequence concentrated around the O-stars in…