NPARSEC : NTT Parallaxes of Southern Extremely Cool objects. Goals, targets, procedures and first results
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Author
Smart, R.L.
Tinney, C.G.
Bucciarelli, B.
Marocco, F.
Abbas, U.
Andrei, A.
Bernardi, G.
Burningham, B.
Cardoso, C.
Costa, E.
Crosta, M.T.
Dapra, M.
Day-Jones, A.
Goldman, B.
Jones, H.R.A.
Lattanzi, M.G.
Leggett, S.K.
Lucas, P.W.
Mendez, R.
Penna, J.L.
Pinfield, D.J.
Smith, Leigh
Sozzetti, A.
Vecchiato, A.
Attention
2299/13873
Abstract
The discovery and subsequent detailed study of T dwarfs have provided many surprises and pushed the physics and modelling of cool atmospheres in unpredicted directions. Distance is a critical parameter for studies of these objects to determine intrinsic luminosities, test binarity and measure their motion in the Galaxy. We describe a new observational programme to determine distances across the full range of T-dwarf subtypes using the New Technology Telescope (NTT)/SOFI telescope/instrument combination. We present preliminary results for ten objects, five of which represent new distances.