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Main-sequence fitting and the Hipparcos open cluster distance scale
M. H. Pinsonneault, D. M. Terndrup, Y. Yuan
The difference between the Hipparcos open cluster distance scale and that obtained from main sequence fitting is examined. The two color main sequence fitting technique of Pinsonne…
Rotational velocities of low-mass stars in the Pleiades and Hyades
Donald M. Terndrup, John R. Stauffer, Marc H. Pinsonneault +5
We have obtained high-resolution spectra of 89 M dwarf members of the Pleiades and Hyades and have derived radial velocities, H-alpha equivalent widths, and spectroscopic rotationa…
The Frequency of Barred Spiral Galaxies in the Near-IR
Paul B. Eskridge, Jay A. Frogel, Richard W. Pogge +9
We have determined the fraction of barred galaxies in the H-band for a statistically well-defined sample of 186 spirals drawn from the Ohio State University Bright Spiral Galaxy su…
Keck Spectra of Brown Dwarf Candidates and a Precise Determination of the Lithium Depletion Boundary in the Alpha Persei Open Cluster
J. R. Stauffer, D. Barrado y Navascués, J. Bouvier +8
We have identified twenty-seven candidate very low mass members of the relatively young Alpha Persei open cluster from a six square degree CCD imaging survey. Based on their I magn…
A Search for Photometric Rotation Periods in Low-Mass Stars and Brown Dwarfs in the Pleiades
Donald M. Terndrup, Anita Krishnamurthi, Marc H. Pinsonneault +1
We have photometrically monitored (Cousins Ic) eight low mass stars and brown dwarfs which are probable members of the Pleiades. We derived rotation periods for two of the stars -…