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A Detailed Comparison of Hubble Space Telescope Faint Object Spectrograph and IUE Ultraviolet Spectra of Selected Seyfert Nuclei
Koratkar, Anuradha; Evans, Ian; Pesto, Sharon +1 more
Despite the contributions of the Hubble Space Telescope Faint Object Spectrograph (FOS) to the archive of UV observations of active galactic nuclei, the vast majority of UV reference data were obtained using the International Ultraviolet Explorer (IUE) satellite. These data remain important since they provide historical information about the inten…
Spin and beat phenomena in time-resolved Hubble Space Telescope UV spectroscopy of PQ GEM
Watson, M. G.; Mason, K. O.; Howell, S. B. +2 more
Results of the first low-resolution (6 Angstroms), time-resolved Hubble Space Telescope (HST) Faint Object Spectrograph (FOS) observation of the prototypical strong-field intermediate polar system, PQ Gem, are presented. The lambdalambda1150-2600 continuum light curve is dominated by the 13.9-min rotational signature of the white dwarf at all UV w…
Ulysses: a summary of the first high-latitude survey
Smith, E. J.; Marsden, R. G.
The unique in-situ observations acquired by the scientific instrumentation on board the Ulysses spacecraft have provided, for the first time, a comprehensive, 3-dimensional view of the heliosphere from the solar equator to the poles near solar minimum. Since beginning its journey out of the ecliptic plane in February, 1992, Ulysses has acquired a …
Photometry with a periodic grid. I. A new method to derive angular diameters and brightness distribution.
Mignard, F.; Hestroffer, D.
The interest of observations of point sources with a periodic grid has been recognized for long in astrometry because of the direct relation existing between the position in the sky and the phase of the modulated signal. We investigate in this paper a complementary aspect by showing how observations of an extended stellar or planetary object carri…
ORFEUS observations of SVI, OVI and PV in the stellar wind from the nucleus of NGC 6543.
Grewing, M.; Appenzeller, I.; Krautter, J. +9 more
During the ORFEUS-SPAS (Orbiting Retrievable Far and Extreme Ultraviolet Spectrometer on the Shuttle Pallet Satellite) mission STS-51, flown in September 1993, we observed, to our knowledge for the first time, the central star of the planetary nebula NGC 6543 in the far ultraviolet (90nm-115nm) wavelength region using the University of California,…
GPM1 - a catalog of absolute proper motions of stars with respect to galaxies
Rybka, S. P.; Yatsenko, A. I.
The description of the first version of the General Compiled Catalogue of Absolute Proper Motions (GPM1) for a sample of HIPPARCOS stars, derived with respect to galaxies within the plan called Catalogue of Faint Stars (KSZ, Deutch 1952), is presented. The principal aim of the GPM1 construction was to provide absolute proper motions of stars to de…
Analysis of Optical and Ultraviolet Spectroscopy of the DAZ White Dwarf G74-7
Bergeron, P.; Wesemael, F.; Billères, M. +1 more
We present new spectroscopic and photometric observations of the cool DAZ white dwarf G74-7. These data are combined with archival HST Faint Object Spectrograph data covering the range 1700-3200 Å, allowing estimates of the Ca, Mg, and Fe abundances in this object. Our analysis suggests that G74-7 is a hydrogen-rich star of normal gravity, with T<…
Comments on the amplification bias in lens statistics
Hamana, Takashi; Futamase, Toshifumi; Futamase, Kayoko +1 more
Amplification bias selection effects play an important role in lens statistics. We carefully examine the effect of amplification bias on lens statistics taking the following points into account. First, because each lens model has its own amplification bias, it must be estimated self-consistently. Secondly, in general, because the bias depends not …
Systematic Errors in the FK5 Catalog as Derived from CCD Observations in the Extragalactic Reference Frame.
Stone, Ronald C.
This paper presents new positions for 689 FK5 stars determined directly in the extragalactic reference system from CCD scan observations made with the Flagstaff Astrometric Scanning Transit Telescope (FASTT). All the observations were made in 1994-1996 with an accuracy of ∼±40 mas in each coordinate. When these positions are compared with their co…
HST-FGS parallaxes of two high-velocity stars.
MacConnell, D. Jack; Osborn, Wayne H.; Miller, Richard J.
Astrometric position measurements with the Hubble Space Telescope's Fine Guidance System have been used to measure the trigonometric parallaxes of two high-velocity stars, R50 = G166-37 and W624 = G16-25. In both cases, the parallaxes are small and confirm large velocities in the galactocentric rest frame. We derive pi_ {abs} = 5.2 +/- 0.7 mas and…