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Constraining the difference in convective blueshift between the components of alpha Centauri with precise radial velocities
(2002-04)
New radial velocities of Cen A & B obtained in the framework the Anglo-Australian Planet Search programme as well as in the CORALIE programme are added to those by Endl et al. (2001) to improve the precision of the orbital ...
Two New Planets from the Anglo-Australian Planet Search
(2001-07)
Precise Doppler measurements from the Anglo-Australian Telescope (AAT) UCLES spectrometer reveal periodic Keplerian velocity variations in the stars HD 160691 and HD 27442. HD 160691 has a period of 743 days, a semiamplitude ...
Mass Beyond the Main Sequence
(World Scientific Publishing, 2001)
Brown dwarfs are now being discovered in significant numbers which means that at last it is possible to be quantitative about their number density and thus their contribution to the stellar neighbourhood. Overall the ...
Gravity dependence at the bottom of the main sequence
(1999)
We investigate the effects of gravity on the infrared spectra of objects around the M dwarf to brown dwarf transition. We focus on observations of the very low-mass objects TVLM513–46546 and GJ 569B from 1 to 2.5 m. These ...
Photospheric Dust in Cool Dwarfs
(Astronomical Society of the Pacific, 1998)
We investigate the optical and infrared spectra for a range of cool dwarfs. For M dwarfs we find that the match between observation and theory is much improved when comparisons are made with models allowing for the formation ...
A New Population of Brown Dwarfs
(Astronomical Society of the Pacific, 1998)
A large area deep survey for brown dwarfs from digitally stacked 1.2m Schmidt plates has revealed a population of very red stars (R-I>3). On the basis of their colours, near IR spectra and their luminosity estimates from ...