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Hubble Space Telescope Ultraviolet Spectroscopy of Two Hot White Dwarfs
Barstow, M. A.; Holberg, J. B.; Lanz, T. +1 more
We have obtained Hubble Space Telescope high-dispersion spectroscopy of two hot white dwarfs using the Goddard High-Resolution Spectrograph. The stars were selected on the basis of EUV flux as examples of H-rich DA stars containing high and low levels of short-wavelength opacity. The high-opacity star, REJ 1614-085, possesses strong features due t…
Measurements of H I and O VI velocity distributions in the extended solar corona with UVCS/SOHO and UVCS/Spartan 201
Romoli, M.; Raymond, J. C.; Naletto, G. +23 more
The Ultraviolet Coronagraph Spectrometer on the Solar and Heliospheric Observatory, UVCS/SOHO, and the Ultraviolet Coronal Spectrometer on the Spartan 201 satellite, UVCS/Spartan, have been used to measure H I 1215.67 A˚ line profiles in polar coronal holes of the Sun at projected heliocentric heights between 1.5 and 3.0 R_solar. UVCS/SOHO also me…
Ultraviolet Photometry of Stars in the Compact Cluster R136 in the Large Magellanic Cloud
Massey, Philip; Lynds, Roger; Hunter, Deidre A. +2 more
We present ultraviolet photometry of stars in the Large Magellanic Cloud star cluster R136. The data were obtained with the refurbished Wide Field/Planetary Camera on the Hubble Space Telescope through an ultraviolet filter centered at 1750 Å (F170W). These data, combined with optical HST observations presented previously, are used to explore the …
The characteristics of the cool component of the cataclysmic binary AE Aquarii derived from its HIPPARCOS parallax
Friedjung, Michael
Observations of the parallax of the cataclysmic binary AE Aqr, using the HIPPARCOS satellite, are combined with the published spectrum and magnitudes in the K band. The radius of the cool component of the binary is probably significantly larger than that of a main sequence star of the same spectral type, though the errors and uncertainties do not …
A weak lensing survey in the fields of z~1 luminous radio sources
Smail, Ian; Bower, Richard G.
In this paper we present weak lensing observations of the fields around eight z~1 luminous radio sources. These data are used to search for the lensing signatures of mass structures that either are physically associated with the radio objects, or are foreground systems projected along the line of sight. The radio sources were all the subjects of d…
Calibrating horizontal-branch stars with Hipparcos.
de Boer, K. S.; Tucholke, H. -J.; Schmidt, J. H. K.
Parallaxes from the Hipparcos satellite allow for the first time to calibrate parameters of horizontal-branch (HB) like stars based on geometric distances. The authors present absolute magnitudes and luminosities for 8 such stars. Using Teff and log g values available from the literature, they also can calculate the mass of the HB stars…
Macromolecules, Very Small Grains, and Large Dust Particles in the Whirlpool Galaxy M51 and Its Companions: A Unified View
Sauvage, Marc; Elmegreen, Bruce G.; Stockton, Alan +1 more
A combined image using optical and mid-infrared ISOCAM data of the galaxy M51 and its companion reveals a unified view of the distribution of dust grains of all sizes. The image shows the large grains in extinction at blue light and the small grains in emission at 15 µm. Much of the emission from small grains coincides with extinction from l…
UV Spectral Classification of O and B Stars in the Small Magellanic =
Bruhweiler, Frederick C.; Smith Neubig, Margaret M.
We present an ultraviolet classification system for 0 and B stars of the Small Magellanic Cloud (SMC). This system is defined by a set of standard, low resolution, International Ultraviolet Explorer (JUE) spectra. This UV classification system results from the development of spectral sequences demonstrating systematic patterus of UV spectral featu…
Accretion and UV Variability in BP Tauri
Gómez de Castro, Ana I.; Franqueira, M.
BP Tau is one of the few classical T Tauri stars for which the presence of a hot spot in the surface has been reported without ambiguity. The most likely source of heating is gravitational energy released by the accreting material as it shocks with the stellar surface. This energy is expected to be radiated mainly at UV wavelengths. In this work w…
Third Interplanetary Network Localization, Time History, Fluence, Peak Flux, and Distance Lower Limit of the 1997 February 28 Gamma-Ray Burst
Frontera, F.; Orlandini, M.; Cline, T. +9 more
The gamma-ray burst of 1997 February 28 was localized using the arrival time analysis method with the Ulysses, BeppoSAX, and WIND spacecraft. The result is a +/-31.5" (3 σ) wide annulus of possible arrival directions that intersects both the position of the burst determined independently by the BeppoSAX Wide Field Camera and the position of a fadi…