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Spectroscopic binary orbits from ultraviolet radial velocities. Paper 24: HD 167771
Stickland, D. J.; Lloyd, C.; Koch, R. H.
[O V] in the Ultraviolet Spectra of Gaseous Nebulae
Feibelman, W. A.; Keenan, F. P.; Hyung, S. +5 more
Theoretical O V electron-density-sensitive emission line ratios for R = I(2s2 1S0 - 2s2p 3P2)/I(2s2 1S0 - 2s2p 3P1) are presented. Inspection of Goddard High Resolution Spectrograph Hubble Space Telescope spectra of RR Tel reveals the pres…
The Cluster Science Data System (csds) - a New Approach to the Distribution of Scientific Data
Escoubet, C. P.; Schwartz, S. J.; Schmidt, R.
High-Resolution V, I, and K-Band Imaging of Faint Field Galaxies from the HST Medium-Deep Survey
Windhorst, Rogier A.; Close, Laird M.; Mutz, Steven B. +2 more
We present infrared and optical data for 13 galaxies with 16.0≤I≤21 mag previously observed with the Hubble Space Telescope as part of a study of 300 galaxies from the Medium-Deep Survey. We observed four of these galaxies at the Steward Observatory 90" and 61" telescopes in the K band (λeff=2.2 µm) with a tip-tilt secondary mirro…
Recurrences of interplanetary interaction regions at southern solar latitudes and approximate harmonics
Lanzerotti, L. J.; Maclennan, C. G.; Thomson, D. J.
A series of low energy (~60 keV/nucl to several MeV/nucl) interplanetary particle enhancements was measured by the HI-SCALE instrument on the Ulysses spacecraft during the first approximately two-thirds of 1993. At this time Ulysses was located between ~4.3 - 5.0 AU and climbing from ~ 23 deg to ~40 deg south heliolatitude. Spectral analyses of th…
Neutral Hydrogen Gunn-Peterson Absorption from an Overdensity in the Diffuse Intergalactic Medium at Redshift 0.8?
Turnshek, David A.; Khersonsky, Valery K.; Strub, Sheflynn M.
The results of a search for diffuse neutral hydrogen ``Gunn-Peterson'' absorption, including possible absorption from any overdensity in the diffuse intergalactic medium, at low to moderate redshifts (z < 1.2) are discussed. The relatively low incidence of Lyα forest lines at these redshifts makes this work more straightforward than would be th…
Coronal radio sounding: Non-Gaussian turbulence in the source regions of slow and fast solar wind
Pätzold, M.; Bird, M. K.; Karl, J.
Structure functions of arbitrary order are analyzed using differential phase scintillation data obtained during the fourth solar conjunction of the Ulysses spacecraft in February-March 1995. The scaling features of these structure functions clearly discriminate between electron density fluctuations observed in coronal holes versus coronal streamer…
Spectroscopic observations of the interacting binary BY Crucis.
Waelkens, C.; Daems, K.
We present multi-wavelength spectroscopic data of the 106 day period interacting binary BY Crucis (Daems et al., 1997A&A...317..823D). The system consist of an early F-type supergiant that fills its Roche lobe and a more massive companion, hidden in a thick accretion disc. In the far-UV spectra (from 1200Å to 1950Å), strong emission lines of h…
The Potsdam contribution to the extragalactic link of the HIPPARCOS pr oper motion system
Scholz, R. -D.; Schilbach, E.; Hirte, S.
Absolute proper motions of 360 Hipparcos stars in 24 fields well distributed over the northern sky were derived from measurements of photographic plates taken mainly with the Tautenburg Schmidt telescope (134/200/400 cm). In each field (about 10 square degrees) a large number of galaxies was used to link the proper motions to the extragalactic ref…
Dust Features of Visually Bright AGB Variables as Seen by ISO and IRAS
Loidl, Rita; Hron, Josef; Kerschbaum, Franz
ISO-SWS spectra of two Mira variables (R Cas and T Dra), taken at two different pulsational phases, are presented. We describe the reduction of the data and the encountered problems. The dust features observed by ISO at different phases and with the Low Resolution Spectrometer of IRAS are compared. We briefly discuss the results in terms of curren…