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Hubble Space Telescope Imaging of the CFRS and LDSS Redshift Surveys. I. Morphological Properties
Tresse, Laurence; Brinchmann, Jarle; Broadhurst, Tom +9 more
We analyze Hubble Space Telescope images of a complete sample of 341 galaxies drawn from the CFRS and LDSS ground-based redshift surveys. In this, the first paper in the series, each galaxy has been morphologically classified according to a scheme similar to that developed for the Medium Deep Survey. We discuss the reproducibility of these classif…
The Far-Ultraviolet Oxygen Airglow of Europa and Ganymede
Feldman, P. D.; Strobel, D. F.; McGrath, M. A. +1 more
Far-UV spectra of Europa and Ganymede, acquired by the Hubble Space Telescope Goddard High Resolution Spectrograph, indicate that, in addition to faintly reflected sunlight, both satellites emit O I 1304 Å and O I 1356 Å airglow radiation. The observed brightnesses of the reflected solar C II 1335 Å feature indicate that the disk-averaged albedos …
The Optical Properties of Gravitational Lens Galaxies as a Probe of Galaxy Structure and Evolution
Keeton, C. R.; Kochanek, C. S.; Falco, E. E.
We combine photometry and lens modeling to study the properties of 17 gravitational lens galaxies between z = 0.1 and ~1. Most of the lens galaxies are passively evolving early-type galaxies, with a few spirals. The colors, scale lengths, and ellipticities of lens galaxies are similar to those of the general population of early-type galaxies, alth…
Ulysses' return to the slow solar wind
Forsyth, R.; Balogh, A.; McComas, D. J. +9 more
After ten long years of wandering the uncharted seas, Ulysses returned to his home port of Ithaca. Similarly, after its unprecedented five year odyssey through the previously uncharted regions over the poles of the Sun, the Ulysses spacecraft has returned to the slow, variable solar wind which dominates observations near the ecliptic plane. Solar …
The Problem of HIPPARCOS Distances to Open Clusters. I. Constraints from Multicolor Main-Sequence Fitting
Pinsonneault, Marc H.; Stauffer, John; Soderblom, David R. +2 more
Parallax data from the Hipparcos mission allow the direct distance to open clusters to be compared with the distance inferred from main-sequence (MS) fitting. There are surprising differences between the two distance measurements, indicating either the need for changes in the cluster compositions or reddening, underlying problems with the techniqu…
Optical-Infrared Spectral Energy Distributions of Z > 2 Lyman Break Galaxies
Sawicki, Marcin; Yee, H. K. C.
Broadband optical and IR spectral energy distributions are determined for spectroscopically confirmed z > 2 Lyman break objects in the Hubble Deep Field (HDF). These photometric data are compared with spectral synthesis models which take into account the effects of metallicity and of internal reddening due to dust. It is found that, on average,…
X-ray flare sparks quake inside Sun
Kosovichev, A. G.; Zharkova, V. V.
Solar flares involve a release of the Sun's magnetic energy as X-radiation, particle beams and high-speed plasma flows. But we have discovered, using data from the Solar and Heliospheric Observatory (SOHO), that these flares also affect the Sun's interior, generating seismic waves similar to earthquakes. For example, a three-kilometre-high seismic…
Carbon Stars
Knapp, Gillian R.; Wallerstein, George
Absolute magnitudes are estimated for carbon stars of various subtypes in the Hipparcos catalogue and as found in the Magellanic Clouds. Stellar radii fall within the limits of 2.4-4.7 AU. The chemical composition of carbon stars indicates that the C-N stars show nearly solar C/H, N/H, and ^12C/^13C ratios. This indicates that much of the C and N …
HST/WFPC2 Observations of Warm Ultraluminous Infrared Galaxies
Sanders, D. B.; Veilleux, Sylvain; Mazzarella, J. M. +2 more
We present new high-resolution B- and I-band images of a nearly complete sample of nine ``warm'' (f25/f60 > 0.2), ultraluminous infrared galaxies (ULIGs) obtained with the Wide Field Planetary Camera of the Hubble Space Telescope (HST). The HST images clearly reveal the presence of tidal tails and other features associated…
The Luminosity Function and Initial Mass Function in the Galactic Bulge
Grillmair, Carl J.; Holtzman, Jon A.; Lynds, Roger +5 more
We present deep photometry obtained with the Hubble Space Telescope in a field in Baade's window in the Galactic bulge. We derive a luminosity function down to I ~ 24.3, or V ~ 27.5, corresponding to M ~ 0.3 M_⊙. The luminosity function from the turnoff down to this level appears remarkably similar to that observed in the solar neighborhood. We de…