19.6k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Kitt Peak National ObservatoryUS401 papers
- Cerro Tololo Inter-American ObservatoryCL274 papers
- U.S. National Science FoundationUS162 papers
- Space Telescope Science InstituteUS159 papers
- California Institute of TechnologyUS116 papers
- University of ArizonaUS99 papers
- Center for Astrophysics Harvard & SmithsonianUS80 papers
- Johns Hopkins UniversityUS71 papers
- University of California, BerkeleyUS58 papers
- University of Wisconsin–MadisonUS58 papers
- Carnegie ObservatoriesUS57 papers
- Goddard Space Flight CenterUS56 papers
58 papers · 1 filter
A Deep Radio Survey of Abell 2125 III: The Cluster Core - Merging and Stripping
F. N. Owen, W. C. Keel, Q. D. Wang +2
We use radio, near-IR, optical, and X-ray observations to examine dynamic processes in the central region of Abell 2125. In addition to the central triple, including members of bot…
Binary and Multiple O-Type Stars in the Cas OB6 Association
Todd C. Hillwig, Douglas R. Gies, William G. Bagnuolo +3
We present the results of time-resolved spectroscopy of 13 O-type stars in the Cas OB6 stellar association. We conducted a survey for radial velocity variability in search of binar…
Infrared Spectroscopy of Symbiotic Stars. IV. V2116 Ophiuchi/GX 1+4, The Neutron Star Symbiotic
Kenneth H. Hinkle, Francis C. Fekel, Richard R. Joyce +3
We have computed, based on 17 infrared radial velocities, the first set of orbital elements for the M giant in the symbiotic binary V2116 Ophiuchi. The giant's companion is a neutr…
An Optical Study of Stellar and Interstellar Environments of Seven Luminous and Ultraluminous X-Ray Sources
Caitlin J. Ramsey, Rosa M. Williams, Robert A. Gruendl +3
We have studied the stellar and interstellar environments of two luminous X-ray sources and five ultraluminous X-ray sources (ULXs) in order to gain insight into their nature. Arch…
A Survey of z>5.7 Quasars in the Sloan Digital Sky Survey IV: Discovery of Seven Additional Quasars
Xiaohui Fan, Michael A. Strauss, Gordon T. Richards +27
We present the discovery of seven quasars at z>5.7, selected from ~2000 deg^2 of multicolor imaging data of the Sloan Digital Sky Survey (SDSS). The new quasars have redshifts z fr…
Far-flung Filaments of Ejecta in the Young Supernova Remnant G292.0+1.8
P. Frank Winkler, Knox S. Long
New optical images of the young SNR G292.0+1.8, obtained from the 0.9-m telescope at CTIO, show a more extensive network of filaments than had been known previously. Filaments emit…
A recalibration of optical photometry: Tycho-2, Strömgren, and Johnson systems
J. Maíz Apellániz
I use HST spectrophotometry to analyze the calibration of 3 optical photometry systems: Tycho-2 B_T V_T, Strömgren u v b y, and Johnson U B V. For Tycho-2, I revisit the analysis o…
Uncovering Planetary Nebulae in Early Type Galaxies using the Rutgers Fabry-Perot
Arend P. N. Sluis, T. B. Williams
We report on observations of four early-type galaxies performed with the Rutgers Fabry-Perot in order to search for Planetary Nebulae (PNe) in these systems. The aim is to use the…
Infrared [Fe II] emission from P Cygni's nebula: Atomic data, mass, kinematics, and the 1600 A.D. outburst
Nathan Smith, Patrick Hartigan
We present moderate and high-dispersion 1-2.5 micron spectra of the 10 arcsec nebula around P Cygni, dominated by bright emission lines of [Fe II]. Observed [Fe II] line ratios dis…
Hot Populations in M87 Globular Clusters
S. T. Sohn, R. W. O'Connell, A. Kundu +5
We have obtained HST/STIS far- and near-UV photometry of globular clusters in four fields in the gE galaxy M87. To a limit of m(FUV) = 25 we detect a total of 66 globular clusters…
Hubble Space Telescope Imaging of the Outburst Site of M31 RV
Howard E. Bond, and Michael H. Siegel
M31 RV is a luminous red variable star that appeared for several months in the bulge of M31 during 1988. Unlike classical novae, M31 RV was cool throughout its outburst. Interest i…
The contrast of magnetic elements in synthetic CH- and CN-band images of solar magnetoconvection
Han Uitenbroek, Alexandra Tritschler
We present a comparative study of the intensity contrast in synthetic CH-band and violet CN-band filtergrams computed from a high-resolution simulation of solar magnetoconvection.…
Neon and Oxygen Abundances in M33
N. R. Crockett, D. R. Garnett, P. Massey +1
We present new spectroscopic observations of 13 H II regions in the Local Group spiral galaxy M33. The regions observed range from 1 to 7 kpc in distance from the nucleus. Of the 1…
Searching for proto-brown dwarfs: Extending near IR spectroscopy of protostars below the hydrogen burning limit
Kevin R. Covey, Thomas P. Greene, Greg W. Doppmann +2
Recent observations of nearby star forming regions have offered evidence that young brown dwarfs undergo a period of mass accretion analogous to the T Tauri phase observed in young…
Stellar Rotation in Young Clusters. II. Evolution of Stellar Rotation and Surface Helium Abundance
W. Huang, D. R. Gies
We derive the effective temperatures and gravities of 461 OB stars in 19 young clusters by fitting the H-gamma profile in their spectra. We use synthetic model profiles for rotatin…
Stellar Rotation in Young Clusters. I. Evolution of Projected Rotational Velocity Distributions
Wenjin Huang, Douglas R. Gies
Open clusters offer us the means to study stellar properties in samples with well-defined ages and initial chemical composition. Here we present a survey of projected rotational ve…
ChaMPlane Optical Survey: Mosaic Photometry
Ping Zhao, Jonathan E. Grindlay, JaeSub Hong +4
The ChaMPlane survey to identify and analyze the serendipitous X-ray sources in deep Galactic plane fields incorporates the ChaMPlane Optical Survey, which is one of NOAO's Long-te…
Photometry and Spectroscopy of Old, Outer Disk Star Clusters: vdB-Hagen 176, Berkeley 29 and Saurer 1
Peter M. Frinchaboy, Ricardo R. Munoz, Randy L. Phelps +2
It has been previously proposed that some distant open clusters in the Milky Way may have been accreted during a dwarf galaxy merger, perhaps associated with the same event that le…
The ACS Virgo Cluster Survey IX: The Color Distributions of Globular Cluster Systems in Early-Type Galaxies
Eric W. Peng, Andres Jordan, Patrick Cote +7
We present the color distributions of globular cluster (GC) systems for 100 Virgo cluster early-type galaxies observed in the ACS Virgo Cluster Survey. The color distributions of i…
The Radial Velocity Distribution of Class I and Flat-Spectrum Protostars
Kevin R. Covey, Thomas P. Greene, Greg W. Doppmann +1
We analyze radial velocities for a sample of 31 Class I and flat spectrum protostars in Taurus-Auriga, rho Ophiuchi and Serpens for evidence of the global dynamical state of extrem…
A Census of Object Types and Redshift Estimates in the SDSS Photometric Catalog from a Trained Decision-Tree Classifier
A. A. Suchkov, R. J. Hanisch, Bruce Margon
We have applied ClassX, an oblique decision tree classifier optimized for astronomical analysis, to the homogeneous multicolor imaging data base of the Sloan Digital Sky Survey (SD…
Mass-to-Light Ratios of Galaxy Groups from Weak Lensing
Laura C. Parker, Michael J. Hudson, Ray G. Carlberg +1
We present the findings of our weak lensing study of a sample of 116 CNOC2 galaxy groups. The lensing signal is used to estimate the mass-to-light ratio of these galaxy groups. The…
The stellar velocity dispersion in the inner 1.3 disk scale-lengths of the irregular galaxy NGC 4449
Deidre A. Hunter, Vera C. Rubin, Rob A. Swaters +2
We present measurements of the stellar velocity dispersion in the inner 1 arcmin radius (1.3 disk scale-lengths) of the irregular galaxy NGC 4449 determined from long-slit absorpti…
The Reddening of Red Supergiants: When Smoke Gets In Your Eyes
Philip Massey, Bertrand Plez, Emily M. Levesque +3
Deriving the physical properties of red supergiants (RSGs) depends upon accurate corrections for reddening by dust. We use our recent modeling of the optical spectra of RSGs to add…