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T-Lyr1-17236: A Long-Period Low-Mass Eclipsing Binary
Jonathan Devor, David Charbonneau, Guillermo Torres +8
We describe the discovery of a 0.68+0.52 solar mass eclipsing binary (EB) with an 8.4-day orbital period, found through a systematic search of ten fields of the Trans-atlantic Exop…
Kinematics of NGC 2264: signs of cluster formation
Gabor Furesz, Lee W. Hartmann, Andrew H. Szentgyorgyi +7
We present results from 1078 high resolution spectra of 990 stars in the young open cluster NGC 2264, obtained with the Hectochelle multiobject echelle spectrograph on the 6.5m MMT…
Kinematic Structure of the Orion Nebula Cluster and its Surroundings
Gabor Furesz, Lee W. Hartmann, S. Thomas Megeath +2
We present results from 1351 high resolution spectra of 1215 stars in the Orion Nebula Cluster (ONC) and the surrounding Orion 1c association, obtained with the Hectochelle multiob…
25 Orionis: A Kinematically Distinct 10 Myr Old Group in Orion OB1a
Cesar Briceno, Lee Hartmann, Jesus Hernandez +4
We report here on the photometric and kinematic properties of a well defined group of nearly 200 low-mass pre-main sequence stars, concentrated within ~ 1 deg of the early-B star 2…
The Peculiar Type Ia Supernova 1999by: Spectroscopy at Early Epochs
J. Vinko, L. L. Kiss, B. Csak +4
We present medium resolution (lambda/Delta lambda = 2500) optical spectroscopy of SN 1999by in NGC 2841 made around its light maximum. The depth ratio of the two Si II features at…