22k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Massachusetts Institute of TechnologyUS255 papers
- California Institute of TechnologyUS233 papers
- Triangle Universities Nuclear LaboratoryUS232 papers
- Center for Astrophysics Harvard & SmithsonianUS218 papers
- Duke UniversityUS195 papers
- University of California, BerkeleyUS186 papers
- Lawrence Berkeley National LaboratoryUS185 papers
- Centre National de la Recherche ScientifiqueFR182 papers
- University of WashingtonUS182 papers
- Princeton UniversityUS178 papers
- The University of Texas at AustinUS168 papers
- Vanderbilt UniversityUS159 papers
25 papers · 2 filters
Ultra High Energy Cosmic Rays from Sequestered X Bursts
Peter L. Biermann, Paul H. Frampton
Assuming that there is no GZK (Greisen-Zatsepin-Kuzmin) cut-off and that super-GZK cosmic rays correlate with AGN (Active Galactic Nuclei) at cosmological distances, it is speculat…
Chemical Composition of the Planet-Harboring Star TrES-1
A. Sozzetti, D. Yong, B. W. Carney +3
We present a detailed chemical abundance analysis of the parent star of the transiting extrasolar planet TrES-1. Based on high-resolution Keck/HIRES and HET/HRS spectra, we have de…
GRB 050911: a black hole - neutron star merger or a naked GRB
K. L. Page, A. R. King, A. J. Levan +16
GRB 050911, discovered by the Swift Burst Alert Telescope, was not seen 4.6 hr later by the Swift X-ray Telescope, making it one of the very few X-ray non-detections of a Gamma-Ray…
Elemental Abundance Ratios in Stars of the Outer Galactic Disk. III. Cepheids
David Yong, Bruce W. Carney, Luisa de Almeida +1
We present metallicities, [Fe/H], and elemental abundance ratios, [X/Fe], for a sample of 24 Cepheids in the outer Galactic disk. The sample have Galactocentric distances covering…
Redshifts and Velocity Dispersions of Galaxy Clusters in the Horologium-Reticulum Supercluster
M. C. Fleenor, J. A. Rose, W. A. Christiansen +4
We present 118 new optical redshifts for galaxies in 12 clusters in the Horologium-Reticulum supercluster (HRS) of galaxies. For 76 galaxies, the data were obtained with the Dual B…
Mode Identification from Combination Frequency Amplitudes in ZZ Ceti Stars
Celeste M. Yeates, J. Christopher Clemens, S. E. Thompson +1
The lightcurves of variable DA stars are usually multi-periodic and non-sinusoidal, so that their Fourier transforms show peaks at eigenfrequencies of the pulsation modes and at su…
Rubidium and lead abundances in giant stars of the globular clusters M 13 and NGC 6752
David Yong, Wako Aoki, David L. Lambert +1
We present measurements of the neutron-capture elements Rb and Pb in five giant stars of the globular cluster NGC 6752 and Pb measurements in four giants of the globular cluster M…
Mg isotope ratios in giant stars of the globular clusters M 13 and M 71
David Yong, Wako Aoki, David L. Lambert
We present Mg isotope ratios in 4 red giants of the globular cluster M 13 and 1 red giant of the globular cluster M 71 based on spectra obtained with HDS on the Subaru Telescope. W…
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…
A New Definition for the Ca4227 Feature: Is Calcium Really Underabundant in Early-type Galaxies?
L. C. Prochaska, James A. Rose, Ricardo P. Schiavon
We have investigated the abundance of calcium in early-type galaxies by measuring the strength of the Ca I 4227 absorption line in their integrated spectra. The database used is th…
Discovery and identification of the very high redshift afterglow of GRB 050904
J. Haislip, M. Nysewander, D. Reichart +39
In 2000, Lamb and Reichart predicted that gamma-ray bursts (GRBs) and their afterglows occur in sufficient numbers and at sufficient brightnesses at very high redshifts (z > 5) to…
A Comparison of the Chemical Evolutionary Histories of the Galactic Thin Disk and Thick Disk Stellar Populations
Mary-Margaret Brewer, Bruce W. Carney
We have studied 23 long-lived G dwarfs that belong to the thin disk and thick disk stellar populations. Abundances have been derived for 24 elements: O, Na, Mg, Al, Si, Ca, Ti, Sc,…
Comment on astro-ph/0507588 and astro-ph/0508483
Daniel E. Reichart
Guidorzi has now written two papers (astro-ph/0507588 and astro-ph/0508483, both accepted to MNRAS) on the GRB variability-luminosity correlation in which he finds that expanded sa…
GRB Variability-Luminosity Correlation Confirmed
Daniel E. Reichart, Melissa C. Nysewander
Recently, Guidorzi et al. (2005) expanded the size of the sample of GRBs for which variabilities and peak luminosities have been measured, from 11 to 32. They confirm the existence…
Force-Free Magnetohydrodynamic Waves: Non-Linear Interactions and Effects of Strong Gravity
Parker Troischt, Christopher Thompson
The propagation and non-linear interactions of magnetohydrodynamic waves are considered in the force-free limit, where the inertia of the conducting matter which enforces the MHD c…
Ensemble Characteristics of the ZZ Ceti stars
Anjum S. Mukadam, M. H. Montgomery, D. E. Winget +2
We present the observed pulsation spectra of all known non-interacting ZZ Ceti stars (hydrogen atmosphere white dwarf variables; DAVs) and examine changes in their pulsation proper…
Elemental Abundance Ratios in Stars of the Outer Galactic Disk. II. Field Red Giants
Bruce W. Carney, David Yong, Luisa de Almeida +1
We summarize a selection process to identify red giants in the direction of the southern warp of the Galactic disk, employing VI_C photometry and multi-object spectroscopy. We also…
Large-Scale Velocity Structures in the Horologium-Reticulum Supercluster
M. C. Fleenor, J. A. Rose, W. A. Christiansen +4
We present 547 optical redshifts obtained for galaxies in the region of the Horologium-Reticulum Supercluster (HRS) using the 6dF multi-fiber spectrograph on the UK Schmidt Telesco…
Early-Time Chromatic Variations in the Wind-Swept Medium of GRB 021211 and the Faintness of its Afterglow
M. C. Nysewander, D. E. Reichart, H. -S. Park +28
We present Follow-Up Network for Gamma-Ray Bursts (FUN GRB) Collaboration observations of the optical afterglow of GRB 021211 made between 143 seconds and 102 days after the burst.…
The Geometry of and Mass Accretion Rate through the Maser Accretion Disk in NGC 4258
J. R. Herrnstein, J. M. Moran, L. J. Greenhill +1
A maximum likelihood analysis of the NGC 4258 maser positions and velocities reveals a ~2 sigma deviation from Keplerian motion in the projected rotation curve of the high-velocity…
A Library of Integrated Spectra of Galactic Globular Clusters
Ricardo P. Schiavon, James A. Rose, Stephane Courteau +1
We present a new library of integrated spectra of 40 Galactic globular clusters, obtained with the Blanco 4-m telescope and the R-C spectrograph at the Cerro Tololo Interamerican O…
Abundances in giant stars of the globular cluster NGC 6752
David Yong, Frank Grundahl, Poul Erik Nissen +2
Recent theoretical yields and chemical evolution models demonstrate that intermediate-mass AGB stars cannot reproduce the observed abundance distributions of O, Na, Mg, and Al. As…
Elemental Abundance Ratios in Stars of the Outer Galactic Disk. I. Open Clusters
David Yong, Bruce W. Carney, Luisa de Almeida
We summarize radial velocity studies of selected stars in the old, distant clusters Berkeley 20, Berkeley 21, NGC 2141, Berkeley 29, and Berkeley 31. Three members of M67 were obse…
Galactic Winds
S. Veilleux, G. Cecil, J. Bland-Hawthorn
Galactic winds are the primary mechanism by which energy and metals are recycled in galaxies and are deposited into the intergalactic medium. New observations are revealing the ubi…