Search Publications
Far-Ultraviolet Imaging of the Field Star Population in the Large Magellanic Cloud with the Hubble Space Telescope
Brosch, Noah; Zurek, David; MacKenty, John +2 more
We present an analysis of the deepest pure UV observations with the highest angular resolution ever performed, a set of 12 exposures with the Hubble Space Telescope (HST) Wide Field Planetary Camera 2 and F160BW filter obtained in parallel observing mode, which covers ~12 arcmin^2 in the Large Magellanic Cloud (LMC), north of the bar, and in the `…
Hubble Space Telescope Imaging Polarimetry of the Gravitational Lens FSC 10214+4724
Hogg, David W.; Eisenhardt, Peter R.; Soifer, B. T. +5 more
We present imaging polarimetry of the extremely luminous, redshift 2.3 IRAS source FSC 10214+4724. The observations were obtained with HST's Faint Object Camera in the F437M filter, which is free of strong emission lines. The 0.7" long arc is unresolved to 0.04" FWHM in the transverse direction and has an integrated polarization of 28%+/-3%, in go…
BOK Globules in the Large Magellanic Cloud
Walsh, J. R.; Chu, Y. -H.; Garnett, D. R. +1 more
We report the discovery of small, isolated dust clouds in the Large Magellanic Cloud (LMC) that are excellent candidates for counterparts to the Bok globules observed in the Galaxy. We detect these small clouds silhouetted against diffuse Hα emission on the basis of parallel imaging with the Wide Field Planetary Camera 2 on the Hubble Space Telesc…
Early Radio Positions of Stars
Assafin, M.; Andrei, A. H.; Puliaev, S. P. +3 more
Early radio positions for a sample of 100 Hipparcos stars, three Tycho-only stars, and nine radio stars with optical positions referred to the Hipparcos/ICRS frame are analyzed. The optical proper motions are used to compare the optical and radio positions. From an original sample of 247 radio positions for the above 112 stars, a set of 220 shows …
A Second Catalog of Orbiting Astronomical Observatory 2 Filter Photometry: Ultraviolet Photometry of 614 Stars
Meade, Marilyn R.
Ultraviolet photometry from the Wisconsin Experiment Package on the Orbiting Astronomical Observatory 2 (OAO 2) is presented for 614 stars. Previously unpublished magnitudes from 12 filter bandpasses with wavelengths ranging from 1330 to 4250 Å have been placed on the white dwarf model atmosphere absolute flux scale. The fluxes were converted to m…
Voyager Far-Ultraviolet Observations of Globular Clusters
Chavez, M.; Landsman, Wayne B.; Holberg, Jay B.
We report on the observations of nine globular clusters carried out by the Voyager ultraviolet spectrometers (UVSs). Three of the observed clusters, M13, NGC 6752, and M70, exhibit an intense far-ultraviolet (FUV) spectrum down to the Lyman limit. However, the spectrum obtained for NGC 6752 is heavily contaminated by the nearby star HD 177999 for …
Optical Positions of 44 Radio Stars from Astrolabe Observations
Wang, Rui; Hu, Hui; Li, Xiaoming
The observations made with the photoelectric astrolabe at Yunnan Observatory since 1986 have been reprocessed in the Hipparcos Catalogue, and the optical positions of 44 radio stars obtained. These are all the stars in common with the Hipparcos Catalogue.
The Demography of Massive Dark Objects in Galaxy Centers
Gebhardt, Karl; Richstone, Douglas; Kormendy, John +9 more
We construct dynamical models for a sample of 36 nearby galaxies with Hubble Space Telescope (HST) photometry and ground-based kinematics. The models assume that each galaxy is axisymmetric, with a two-integral distribution function, arbitrary inclination angle, a position-independent stellar mass-to-light ratio Upsilon, and a central massive dark…
Multipolar Bubbles and Jets in Low-Excitation Planetary Nebulae: Toward a New Understanding of the Formation and Shaping of Planetary Nebulae
Trauger, John T.; Sahai, Raghvendra
First results from a Hubble Space Telescope Wide Field Planetary Camera 2 Hα imaging survey of young planetary nebulae (PNs) are reported. The PNs have been selected on the basis of their low excitation characteristics. All objects imaged so far show highly aspherical morphology, with a majority characterized by multipolar bubbles distributed roug…
ICCD Speckle Observations of Binary Stars. XIX. an Astrometric/Spectroscopic Survey of O Stars
Gies, Douglas R.; Bagnuolo, William G., Jr.; Mason, Brian D. +3 more
We present the results of a speckle interferometric survey made with the CHARA speckle camera and 4 m-class telescopes of Galactic O-type stars with V < 8. We can detect with the speckle camera binaries in the angular separation range 0.035" < rho < 1.5" with Deltam < 3, and we have discovered 15 binaries among 227 O-type systems. We c…