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Rotation periods of late-type stars in the young open cluster IC 2602
Sydney A. Barnes, Sabatino Sofia, Charles F. Prosser +1
We present the results of a monitoring campaign aimed at deriving rotation periods for a representative sample of stars in the young (30 Myr) open cluster IC 2602. Rotation periods…
Brown Dwarfs
Ben R. Oppenheimer, S. R. Kulkarni, John R. Stauffer
After a discussion of the physical processes in brown dwarfs, we present a complete, precise definition of brown dwarfs and of planets inspired by the internal physics of objects b…
Discovery of a Very Low-Mass Binary with HST/NICMOS
E. L. Martin, G. Basri, W. Brandner +7
Hubble Space Telescope NICMOS observations are presented of six brown dwarf candidates in the Pleiades open cluster. One of them, namely CFHT-Pl-18, is clearly resolved as a binary…
Stellar Activity in Coeval Open Clusters: Praesepe and The Hyades
D. Barrado y Navascues, J. R. Stauffer, S. Randich
Randich and Schmitt [1995, A&A 298, 115] found that the coronal activity of solar-type and low mass stars in Praesepe is significantly lower than that of stars in the Hyades cluste…
Keck Spectra of Pleiades Brown Dwarf Candidates and a Precise Determination of the Lithium Depletion Edge in the Pleiades
John Stauffer, Greg Schultz, J. Davy Kirkpatrick
We have obtained intermediate resolution spectra of eleven candidate brown dwarf members of the Pleiades open cluster using the Keck II telescope and LRIS spectrograph. Our primary…
The Problem of Hipparcos Distances to Open Clusters: I. Constraints from Multicolor Main Sequence Fitting
Marc H. Pinsonneault, John Stauffer, David R. Soderblom +2
Parallax data from the Hipparcos mission allow the direct distance to open clusters to be compared with the distance inferred from main sequence (MS) fitting. There are surprising…