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Discovery of Two T Dwarf Companions with the Spitzer Space Telescope
K. L. Luhman, B. M. Patten, M. Marengo +12
We report the discovery of T dwarf companions to the nearby stars HN Peg (G0V, 18.4 pc, ~0.3 Gyr) and HD 3651 (K0V, 11.1 pc, ~7 Gyr). During an ongoing survey of 5'x5' fields surro…
Calibrating the Solar Dynamo: Magnetic Activity Cycles of Southern Sun-like Stars
T. S. Metcalfe, T. J. Henry, M. Knolker +1
The solar magnetic activity cycle is responsible for periodic episodes of severe space weather, which can perturb satellite orbits, interfere with communications systems, and bring…
First Results from the CHARA Array. IV. The Interferometric Radii of Low-Mass Stars
D. H. Berger, D. R. Gies, H. A. McAlister +8
We have measured the angular diameters of six M dwarfs with the CHARA Array, a long-baseline optical interferometer located at Mount Wilson Observatory. Spectral types range from M…