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The spectrum of the VV Cephei star KQ Puppis (Boss 1985). II. Atlas of the optical and ultraviolet spectrum.
Altamore, A.; Rossi, C.; Baratta, G. B. +1 more
An Atlas is presented of the high-resolution spectrum of the VV Cep M1-2Iab + Be variable KQ Pup (Boss 1985). The Atlas is based on UV observations obtained in 1979 with the IUE (covering the region from 1223 A to 3228 A) and on coude plates covering the blue to the optical UV. The equivalent widths and radial velocities of the main features prese…
The Spacelab-1 very wide field survey of UV-excess objects. III. Analysis of the IUE high-resolution spectra of two very hot sdO stars.
Deleuil, M.; Viton, M.
The IUE high resolution spectra of CPD-71 deg 172B had LSII+18 deg 9 (two subdwarfs with T(eff) = 60,000 K) are compared through a differential curve of growth technique. About 300 lines belonging to 15 ions have been identified in a series of selected windows, representing a global spectral domain of 50 A. Unknown lines account for 37 to 80 perce…
Ultraviolet Emission in the Dark Cloud Toward HD 62524
O'Donnell, James E.; Cardelli, Jason A.; Churchwell, Ed
We have obtained low resolution IUE short wavelength spectra at several positions within a ridge of molecular gas within the Gunn Nebula. Optical absorption line measurements toward HD 62542 indicate moderately high densities within the ridge. The physical appearance of the ridge, along with H-alpha and IRAS images of the nebula, suggest that wind…
High Resolution Imaging of QSO 2305+187 (=4C 18.68)
Hutchings, J. B.; Neff, S. G.; Crabtree, D. +1 more
We present optical imaging of QSO 2305+187 with resolution ranging from 0.1 to 1.0 arcsec, in continuum and line emission. The data are from FOCAM and the HR Cam of the Canada-France-Hawaii telescope, and the Wide Field Camera of the Hubble Space Telescope. These are compared with previously published optical and radio images. The QSO host galaxy …
Periodic errors of stellar abscissae in the HIPPARCOS experiment caused by oscillations of the basic angle
Makarov, V. V.
The problem of stellar abscissae error propagation originating from systematic variations of the basic angle during one turn of the Hipparcos satellite is investigated within the framework of a general data processing algorithm. These variations may be caused by systematic irregularities of the heat flux from solar radiation as the satellite's opt…
The effect of the shock of 15:43 UT March 23, 1991 on 50 keV to 5 MeV ions at Ulysses
Simnett, G. M.; Armstrong, T. P.; Roelof, E. C. +2 more
The intensities, angular distributions, and energy spectra of 50 keV to 5 MeV ions are examined in the several hour time interval when an interplanetary shock passed the Ulysses spacecraft. The increase in intensity, evolution of pitch angle distribution from upstream flow away from the shock to a post-shock “pancake” distribution, the earlier arr…
Method of comparison between determinations of the HIPPARCOS attitude
Donati, F.; Sechi, G.
An attitude comparison method for assessing the quality of the attitude estimates obtained by the Hipparcos data reduction consortia (FAST and NDAC) is presented. The method is illustrated by results obtained in a typical FAST-NDAC comparison developed during the attitude determination assessment phase. The aim of the attitude comparison is, initi…
Ultraviolet Observations of the Symbiotic Star AS 296
Feibelman, W. A.; Moreno, H.; Gutierrez-Moreno, A.
AS 296 is a well-known S-type symbiotic star which underwent an optical outburst during 1988. In this paper, UV data based on IUE observations obtained both during the quiescent and outburst stages are presented and discussed, correlating them to observations made in the optical region. It is concluded that the object is a symbiotic nova, in which…
Properties of the SN 1987A Circumstellar Ring and the Distance to the Large Magellanic Cloud: Erratum
Panagia, N.; Kirshner, R. P.; Macchetto, F. +2 more
Figures 2 and 3 of the Letter "Properties of the SN 1987A Circumstellar Ring and the Distance to the Large Magellanic Cloud," by N. Panagia, R. Gilmozzi, F. Macchetto, H.-M. Adorf, and R. P. Kirshner (ApJ, 380, L23 [1991]), contained some errors; i.e., Figure 2 had the wrong theoretical curve as a fit to the time evolution of the C III)λ1909 line …
Diffusive shock acceleration and the March 1991 solar events
Krupp, N.; Keppler, E.; Korth, A. +7 more
Spectral and anisotropy measurements are reported for protons between 0.5 and 1.4 MeV during the particle increases associated with the passage of 3 interplanetary shocks past Ulysses between March 19 and March 31 1991. The data are interpreted in terms of diifusive shock acceleration in the travelling solar induced disturbances to the solar plasm…