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Structure of the Solar Wind and Compositional Variations
Bochsler, P.
The composition of the solar wind is largely determined by the composition of the source material, i.e. the present-day composition of the outer convective zone. It is then modified by the processes which operate in the transition region and in the inner corona. In situ measurements of the solar wind composition give a unique opportunity to obtain…
The IUE Spectra of Three Optically Narrow-Line O VI Planetary Nebulae: NGC 1501, IC 1747, and IC 1297
Feibelman, Walter A.
The IUE spectra of NGC 1501, IC 1747, and IC 1297 have been analyzed with the Final Archive NEWSIPS processing and contain a large amount of new information. The UV spectra of the first two objects have received very little attention up to now, although they belong to the astrophysically rare but important group of planetary nebulae that exhibit O…
The pulsating yellow supergiant V810 Centauri
Meynet, G.; Burki, G.; Burnet, M. +1 more
The F8 Ia supergiant
MG II h&k line diagnostics of IM Pegasi
Houdebine, E. R.; Dempsey, R. C.; Olah, K. +2 more
We have analysed the Mgii h&k resonance lines of IM Peg (KII-III) on 14 high resolution IUE LWR spectra and compared the results coming from visual spectroscopic and UBV(RI)_C photometric data. The `clean' spectra (free from interstellar absorption) were modelled using a convolution of the rotational profile with a Gaussian profile, that repre…
Phase-resolved Hubble Space Telescope ultraviolet spectroscopy of V795 HER
Prinja, R. K.; Mason, K. O.; Howell, S. B. +2 more
We present highly time-resolved HST FOS UV spectroscopy of the nova-like binary V795 Her. Several key results emerge. For the first time we find a strong 2.6-h signature in the variability of the UV lines. The HST data reveal no evidence of a 4.8-h `period', in contrast to our previous IUE observations. This, and differences in the spectral line c…
The HIPPARCOS solar system objects catalogues
Lindegren, L.; Mignard, F.; Hestroffer, D. +3 more
Astrometric and photometric measurements of a number of solar system objects were performed by the Hipparcos satellite in both the Hipparcos main mission and the Tycho experiment. The results concern mainly asteroids but also the planetary satellites Europa, Ganymede, Callisto, Titan and Iapetus, and the major planets Uranus and Neptune. The speci…
Interstellar pickup hydrogen observations at large heliocentric distances
Gazis, P. R.; Mihalov, J. D.
Possible signatures of interstellar pickup hydrogen have been identified in data from the Pioneer 10 and 11 Ames plasma analyzers at locations out to beyond the orbit of Saturn, and at a wide range of longitudes in the heliosphere, both upstream and downstream in the interstellar wind. These signatures provide an extension of pickup ion observatio…
Atomic Data and Spectral Line Intensities for Mg VIII
Bhatia, A. K.; Thomas, Roger J.
EUV spectral lines of Mg VIII have been observed from the solar corona by Skylab, SERTS, and more recently by SOHO. Atomic data for this astrophysically important ion are presented in this paper. The atomic data include energy levels, oscillator strengths, transition rates, and electron-impact excitation collision strengths. Twenty levels are incl…
Galaxies with Spiral Structure up to Z ~ 0.87: Limits on M/L and the Stellar Velocity Dispersion
Quillen, A. C.; Sarajedini, V. L.
We consider seven distant galaxies with clearly evident spiral structure from Hubble Space Telescope images. We place upper limits on their mass-to-light ratios (M/L) by computing M/L_B for a maximal disk. We find that these galaxies have maximal-disk mass-to-light ratios M/L_B = 1.5-3.5 (M/L_B)_⊙ at the low end, but within the range seen in nearb…
ISO SWS Spectroscopy of WR 146 (WC6+O)
Crowther, P. A.; Willis, A. J.; Morris, P. W. +2 more
We have obtained ISO SWS spectroscopy of WR 146 (WC6+O) covering the wavelength range 2.6-20 µm. WC6 wind emission is observed in numerous lines of He II and C IV, as well as in the [Ne III] 15.5 µm line, but not in [Ne II] 12.81 or [Ne V] 14.32 µm. An analysis of these spectra (and complementary radio and optical data) yields for the WC6 star: v∞…