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The alpha-element abundances in the most oxygen-poor planetary nebula PN G 135.9+55.9
M. G. Richer, G. H. Tovmassian, G. Stasinska +5
We present extensive new spectroscopy and imaging of PN G 135.9+55.9. We use these data as constraints to photoionization models to derive limits on the oxygen abundance. We find t…
The missing M dwarfs
Paul D. Dobbie, David J. Pinfield, Richard F. Jameson +1
We present evidence which indicates the luminosity functions of star forming regions, open star clusters and the field dips between spectral types M7-M8. We attribute this to a sha…
Brown dwarf populations in open clusters
Tim Adams, Melvyn B. Davies, Richard F. Jameson +1
We present the results of multiple simulations of open clusters, modelling the dynamics of a population of brown dwarf members. We consider the effects of a large range of primordi…