Search Publications
The Temperature of the Supergiant gamma Per
Evans, Nancy Remage; Teays, Terry J.; Lester, John B. +2 more
Because the bright supergiant α Per is located in cluster, and because its angular diameter has been measured, its log g is known observationally, as is its atmospheric microturbulence. Using these observed parameters, we compare its energy distribution derived from lUE spectra and B, V, R, I, J, and K with model atmospheres convolved with instrum…
High Signal-to-Noise Ratio Observations of Weak Interstellar Absorption Lines Towards XI Ophiuchi With the Goddard High-Resolution Spectrograph Aboard the Hubble Space Telescope
Savage, B. D.; Ebbets, D. C.; Carpenter, K. G. +18 more
We present an atlas and tabulation of weak interstellar absorption lines in the ultraviolet spectrum of ζ Ophiuchi in four selected wavelength regions observed with the Goddard High Resolution Spectrograph aboard the Hubble Space Telescope. The signal-to-noise ratio ranges from 150 to nearly 400, and the spectral resolving power exceeds 20 000, al…
The Brightest Stars in Nearby Galaxies IX: Comparison of Ground-Based and HST Photometry of the Brightest Stars in IC 4182
Labhardt, Lukas; Saha, Abhijit; Sandage, Allan +2 more
The distance to the Sdm dwarf galaxy IC 4182 is known from the measurements of its Cepheids made with the prerepair HST by Saha et al. [ApJ, 425,14(1994)]. IC 4182 is the parent galaxy of the type Ia supernova 1937C. Because of this it is important for calibrating the SNe Ia prime distance indicator as well as other secondary indicators. We compar…
Time Resolved Ultraviolet Spectroscopy of DQ Herculis: Eclipses and Pulsations
Anderson, Scott F.; Margon, Bruce; Downes, Ronald A. +1 more
The magnetic cataclysmic variable DQ Herculis was observed with the Faint Object Spectrograph onboard the Hubble Space Telescope (HST) over four consecutive satellite orbits, including the first observation in the UV of DQ Her through eclipse minimum. Strong emission in N V, C IV, Si IV, and He II and weak emission in O I, S III, Ni II, N IV, Si I…
Determination of Position of Jupiter From Very-Long Baseline Interferometry Observations of ULYSSES
Mannucci, A. J.; Folkner, W. M.; McElrath, T. P.
Very-long baseline interferometry (VLBI) observations of the Ulysses spacecraft near its encounter with Jupiter on 1992 February 8 were made to determine the angular position of Jupiter with respect to well known extragalactic radio sources. Spacecraft range and Doppler data were used to determine the position of the spacecraft with respect to Jup…
An Extremely Thin Gravitational Arc Formed by the Distant Cluster CL 0016+1609: Lensing of a Compact HDF-Type Object?
Lavery, Russell J.
Hubble Space Telescope WFPC2 images of the core of the distant cluster of galaxies CL 0016+1609 (z =0.545) have revealed a single extremely thin faint arc, likely produced by gravitational lensing of a very distant background galaxy. The arc, which we refer to as Arc-1, is ~3.5 arcsec in extent, has a radius of curvature of 25+/-5 arcsec, and subt…
Voyager Observations of the Companiion of the Classical Cepheid S MUSCAE
Evans, Nancy Remage; Holberg, J. B.; Polidan, Ronalds S.
We have observed the companion of the Cepheid S Mus with the Voyager ultraviolet spectrometer, including a spectrum of the background. We have derived the energy distribution from 912 to 3200 Å using the reddening obtained from Cepheid colors corrected for the effect of the companion. This has been compared with three Morgan-Keenan "dagger" spectr…
HST Observations of the Radio Galaxy MG 1136+1346 (z=1.003)
Dickinson, Mark; Spinrad, Hyron; Stern, Daniel
We present images taken with the prerefurbishment Hubble Space Telescope of the z = 1.003 radio galaxy MG 1136+1346 as part of a morphological study of the high-redshift radio-source population. The galaxy has a bright, unresolved nuclear component which contributes approximately half of the total light in the observed V (F555W) and I (F785LP) ban…
The Discovery of a Small Group of Galaxies in Ursa Major by the Hubble Space Telescope
Malumuth, Eliot M.; Sandoval, Jennifer L.
We present HST/WFPC2 images of a previously unknown loose group of galaxies in Ursa Major. These images were obtained as part of the GTO parallel program in which WFPC2 images are taken using the F606W (wide V) and F814W (I band) filters in parallel with GTO observations using other HST instruments. These WFPC2 images, obtained in parallel with FG…
The Centers of Early-Type Galaxies with HST.I.An Observational Survey
Faber, S. M.; Dressler, A.; Byun, Y. -I. +6 more
We have obtained V-band images of 45 nearby elliptical galaxies and bulges using the original Planetary Camera of the Hubble Space Telescope. The majority of the sample is at distances of 10-20 Mpc. This represents a substantial increase in the number of galaxies that have been studied at a resolution of a few parsecs. At this resolution, many gal…