4 papers
On the Interpretation of the Optical Spectra of L-type Dwarfs
Ya. Pavlenko, M. R. Zapatero Osorio, R. Rebolo
We present synthetic optical spectra in the range 640-930 nm of a sample of field L dwarfs and the brown dwarf GL229B. Our computations show that Li, Na, K, Rb, and Cs govern the s…
Brown Dwarfs in the Pleiades Cluster. II. J, H and K photometry
M. R. Zapatero Osorio, E. L. Martin, R. Rebolo
We have obtained near-IR observations of some of the faintest objects so far known towards the Pleiades cluster, with the aim of investigating the sequence that connects cluster ve…
Brown Dwarfs in the Pleiades Cluster: a CCD-based R,I survey
M. R. Zapatero Osorio, R. Rebolo, E. L. Martin
We have obtained deep CCD R and I mosaic imaging of 578 arcmin within 1.5 of the Pleiades' center -- reaching a completeness magnitude I=19.5 -- with the aim of fin…
Stars Approaching the Substellar Limit in the alpha Persei Open Cluster
M. R. Zapatero Osorio, R. Rebolo, E. L. Martin +1
We present intermediate dispersion optical spectroscopy for seven very low-mass stars in the alpha Per open cluster with spectral types between M3 and M6, including the brown dwarf…