261 citations · 7.8k across the 156 of their papers we have counts for
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Contamination and exclusion in the sigma Orionis young group
Ben Burningham, Tim Naylor, S. P. Littlefair +1
We present radial velocities for 38 low-mass candidate members of the sigma Orionis young group. We have measured their radial velocities by cross-correlation of high resolution (R…
The Lithium Depletion Boundary in NGC 2547 as a test of pre-main-sequence evolutionary models
R. D. Jeffries, J. M. Oliveira
Intermediate resolution spectroscopy from the ESO Very Large Telescope is analysed for 63 photometrically selected low-mass (0.08-0.30 Msun) candidates of the open cluster NGC 2547…
Pre-main-sequence Lithium Depletion
R. D. Jeffries
In this review I briefly discuss the theory of pre-main-sequence (PMS) Li depletion in low-mass (0.075<M<1.2 Msun) stars and highlight those uncertain parameters which lead to subs…
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…
The Li Overabundance of J37: Diffusion or Accretion?
J. F. Ashwell, R. D. Jeffries, B. Smalley +3
In September 2002 the discovery of a super Li-rich F-dwarf (J37) in NGC 6633, an iron poor analogue of the better studied Hyades and Praecepe open clusters, was announced. This uni…
Low mass stars, brown dwarf candidates and the mass function of the young open cluster NGC 2547
R. D. Jeffries, Tim Naylor, C. R. Devey +1
We present a catalogue of RIZ photometry over an area of 0.855 square degrees, centred on NGC 2547. The survey is substantially complete to limits of R_c=21.5, I_c=19.5, Z=19.5. We…