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61 papers · 1 filter
Dynamical Mass Constraints on Low-Mass Pre-Main-Sequence Stellar Evolutionary Tracks: An Eclipsing Binary in Orion with a 1.0 Msun Primary and an 0.7 Msun Secondary
Keivan G. Stassun, Robert D. Mathieu, Luiz Paulo R. Vaz +2
We report the discovery of a double-lined, spectroscopic, eclipsing binary in the Orion star-forming region. We analyze the system spectroscopically and photometrically to empirica…
A Survey of Open Clusters in the u'g'r'i'z' Filter System: I. Results for NGC2548 (M48)
Cristin J. Rider, Douglas L. Tucker, J. Allyn Smith +3
We present initial results of a photometric survey of open star clusters, primarily in the southern hemisphere, taken in the u'g'r'i'z' filter system. While our entire observed sam…
Infrared Spectroscopic Study of 8 Galactic Globular Clusters
Andrew W. Stephens, Jay A. Frogel
We have obtained medium-resolution infrared K band spectra of 44 giants in seven heavily reddened clusters in the Galactic bulge, as well as 12 giants in omega Centauri. We measure…
A Near-Infrared Multiplicity Survey of Class I/Flat-Spectrum Systems in Six Nearby Molecular Clouds
Karl E. Haisch, Thomas P. Greene, Mary Barsony +1
We present new near-IR observations of 76 Class I/flat-spectrum objects in the nearby (d < 320 pc) Perseus, Taurus, Chamaeleon I and II, rho Ophiuchi, and Serpens dark clouds. Thes…
Hubble Diagrams of Type Ia Supernovae in the Near Infrared
Kevin Krisciunas, Mark M. Phillips, Nicholas B. Suntzeff
From observations of 7 Type Ia supernovae obtained during the last four years at the Las Campanas and Cerro Tololo Inter-American Observatories, along with previous published data…
The Asymmetric Thick Disk: A Star Count and Kinematic Analysis. II The Kinematics
Jeniffer E. Parker, Roberta M. Humphreys, Timothy C. Beers
We report a kinematic signature associated with the observed asymmetry in the distribution of thick disk/inner halo stars interior to the Solar circle described in Paper I. In that…