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113 papers · 1 filter
STIS Near Ultraviolet Time-Tagged Spectra of the Crab Pulsar
Theodore R. Gull, Don J. Lindler, D. Michael Crenshaw +8
We present the spectrum and pulse profile of the Crab Pulsar in the near ultraviolet (1600-3200 Angstroms) observed with the Space Telescope Imaging Spectrograph (STIS) during the…
The decay of optical emission from the Gamma-Ray Burst GRB 970228
Titus J. Galama, Paul J. Groot, Jan van Paradijs +6
We present the R_c band light curve of the optical transient (OT) associated with GRB970228, based on re-evaluation of existing photometry. Data obtained until April 1997 suggested…
Molecular Hydrogen and Paschen-alpha Emission in Cooling Flow Galaxies
Heino Falcke, M. J. Rieke, G. H. Rieke +2
We present near-infrared spectra obtained to search for Pa-alpha and molecular hydrogen lines in edge-darkened (FR I-type) radio galaxies with bright Halpha emission in the redshif…
Discovery of a Supernova Explosion at Half the Age of the Universe and its Cosmological Implications
S. Perlmutter, G. Aldering, M. Della Valle +20
The ultimate fate of the universe, infinite expansion or a big crunch, can be determined by measuring the redshifts, apparent brightnesses, and intrinsic luminosities of very dista…
Mixing processes during the evolution of red giants with moderate metal deficiencies : the role of molecular-weight barriers
Corinne Charbonnel, Jeffery A. Brown, George Wallerstein
We have assembled accurate abundance data for Li, C, and N as well as the 12C/13C ratio for five field giants with [Fe/H]=-0.6 including Arcturus and two stars in the globular clus…
On the difficulty of launching an outflow from an accretion disk
Gordon I. Ogilvie, Mario Livio
We solve for the local vertical structure of a thin accretion disk threaded by a poloidal magnetic field. The angular velocity deviates from the Keplerian value as a result of the…