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Spectrophotometric Data of the Central Star of the Large Magellanic Cloud Planetary Nebula N66: Quantitative Analysis of Its WN-Type Spectrum
Hamann, W. -R.; Koesterke, L.; Torres-Peimbert, S. +5 more
Hubble Space Telescope, IUE, and ground-based observations of the central star of the LMC planetary nebula N66 (CS N66), obtained in different epochs, are presented. Since 1990, CS N66 has displayed remarkable short- and long-term spectroscopic and photometric changes amounting to more than 3 mag in the optical. Expanding model atmospheres have be…
HST Images of the High-Excitation Herbig-Haro Object HH 32
Noriega-Crespo, A.; Raymond, J.; Curiel, S. +2 more
We present high angular resolution emission-line and continuum images of the remarkable Herbig-Haro jet HH 32 obtained with the Wide Field and Planetary Camera 2 (WFPC2) aboard the Hubble Space Telescope. We have obtained narrow band [S ii] λλ6716,673l, [N ii] 6583 and Hα images, as well as an R continuum image, of this HH jet. The 0."l spatial re…
Ultraviolet Imaging of the Globular Cluster 47 Tucanae
O'Connell, Robert W.; Bohlin, Ralph C.; Landsman, Wayne B. +8 more
We have used the Ultraviolet Imaging Telescope to obtain far-UV (1620 Å), wide field (40' diameter) images of the prototypical metal-rich globular cluster 47 Tucanae. We find a population of about 20 hot (Teff>9000 K) objects near or above the predicted UV luminosity of the hot horizontal branch (HB) and lying within two half-light r…
Spatially Resolved Spectra of V1974 Cygni (Nova Cygni 1992) with the Goddard High Resolution Spectrograph
Shore, Steven N.; Hauschildt, Peter H.; Starrfield, Sumner +1 more
We report the observation of spatially resolved low-resolution GHRS spectra of the shell of the bright Galactic ONeMg nova Cygni 1992. The spectra were obtained in 1995 September, after the X-ray turnoff of the nova. We have determined the dynamical structure of the ejecta and show the evolution of the ionization within the ejecta. Abundance limit…
The High-Redshift Radio Galaxy MRC 0406-244
McCarthy, Patrick J.; Persson, S. E.; Athreya, Ramana M. +1 more
We present HST and ground-based multiwavelength observations of the distant radio galaxy MRC 0406-244. Ground-based visible and near-IR images reveal two distinct components that are aligned with the radio source axis. One of these has the red optical-to-IR and blue UV colors characteristic of radio galaxies, while the other is red in all colors. …
Gamma-Ray Burster Counterparts: Hubble Space Telescope Blue and Ultraviolet Data
Schaefer, Bradley E.; Cline, Thomas L.; Hurley, Kevin C. +1 more
The surest solution of the gamma-ray burst (GRB) mystery is to find an unambiguous low-energy quiescent counterpart. However, to date no reasonable candidates have been identified in the X-ray, optical, infrared, or radio ranges. The Hubble Space Telescope (HST) has now allowed for the first deep ultraviolet searches for quiescent counterparts. Th…
LH 72, the Center of Constellation III
Hodge, Paul W.; Wilcots, Eric M.; Olsen, Knut A. G. +1 more
Ultraviolet spectroscopy with IUE is combined with optical photometry to study the brightest blue members of the LMC OB association LH 72. LH 72 lies near the geometric center of Shapley's Constellation III, a complex of gas and stars that makes up one of the largest known superbubbles. Ages for the stars range from 5 × 106 to 1.5 × 10<…
Oxygen-rich Mira variables: near-infrared luminosity calibrations. Populations and period-luminosity relations.
Luri, X.; Barthes, D.; Mattei, J. A. +2 more
HIPPARCOS astrometric and kinematical data of oxygen-rich Mira variables are used to calibrate absolute near-infrared magnitudes and kinematic parameters. Two sets of near-infrared magnitudes compiled from different authors are used: broad-band K and narrow-band photometric measurements at 1.04µm (104 filter). Three distinct classes of stars…
An estimate of large-scale solar wind density and velocity profiles in a coronal hole and the coronal streamer belt
Tsurutani, Bruce T.; Pätzold, Martin; Bird, Michael K.
With the use of the total electron content data obtained by the Ulysses Solar Corona Experiment (SCE) during the first solar conjunction in summer 1991, two data sets were selected, one associated with a coronal hole and the other associated with coronal streamer belt crossings. To determine a large-scale coronal streamer belt density profile, the…
The Detection of the λ2175 Feature and Further Analysis of the Broad Absorption Line Profile Structure in the Gravitational Lens Candidate UM 425
Kazanas, Demosthenes; Falco, Emilio E.; Michalitsianos, Andrew G. +1 more
We obtained Multiple Mirror Telescope spectra of the gravitational lens candidate UM 425 to compare the redshifts and line profile structures of lens components A and B, which are separated by approximately 6.5". The C IV λ1550 emission in both A and B exhibits broad absorption line (BAL) structure, consistent with the earlier detection of BAL str…