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HST UV observations of the accretion disk corona X-ray binary X1822-371
Mason, K. O.; Cordova, F. A.; Puchnarewicz, E. M.
The Faint Object Spectrograph on the Hubble Space Telescope has provided the first ultraviolet orbital light curve of the low-mass X-ray binary X1822-371. The shape of the UV light curve changes with wavelength providing the first direct clues to the temperature of the various system components. The data support the idea that the system contains a…
Whistler-mode wave generation around interplanetary shocks in and out of the ecliptic plane
Balogh, A.; Forsyth, R. J.; Scime, E. E. +5 more
We present a study of whistler-mode wave generation and wave particle interaction in the vicinity of interplanetary shocks in and out of the ecliptic plane, as observed by the Ulysses spacecraft. We focus here on one shock in the ecliptic plane as a reference and three shocks obtained at -30, -54 and -55.4 degrees of heliographic latitude respecti…
Magnetic observations during the recent declining phase of solar activity
Smith, E. J.
Changes in the heliospheric magnetic field during the recent declining phase in solar activity are reviewed and compared with observations during past sunspot cycles. The study is based principally on data obtained by IMP-8 and Ulysses. The field magnitude is found to have increased during the declining phase until it reached a maximum value of 11…
A Non-LTE Analysis of the zeta Aurigae B-Type Secondary. I. Determination of the Fundamental Stellar Parameters
Bennett, Philip D.; Brown, Alexander; Linsky, Jeffrey L.
We present a non-LTE model atmosphere analysis of the B star secondary of ζ Aurigae (B5 V+K4 Ib) and determine its stellar parameters. A grid of model atmospheres and synthetic spectra were computed for stellar parameters typical of mid-B stars, using the TLUSTY and SYNSPEC codes of Hubeny with the lines and continua of H and He calculated in non-…
Optical and UV spectroscopy of stars in the direction of the Riegel & Crutcher cold cloud
Bates, B.; Kemp, S. N.; Montgomery, A. S.
Optical and UV spectral data are presented for the stars HD 165202, 168708 which lie in the direction of the Riegel & Crutcher cold cloud. These observations complement our earlier studies in which high-resolution HI profiles mapped the cold cloud in self-absorption (Montgomery et al.). HD 165202 lies in a direction close to where we observe a…
Ulysses Observations of 26 Day Intensity Variations of Cosmic Rays and Anomalous Helium over the South Pole
Smith, E. J.; Phillips, J. L.; McKibben, R. B. +3 more
Ulysses observations of a coronal origin particle event at 32° south heliographic latitutde
Simnett, G. M.; Pick, M.; Kerdraon, A. +6 more
A remarkable streaming beam-like particle event of 60 keV-5 MeV ions and of 38 315 keV electrons has been reported previously. This event has been associated with the passage of a Coronal Mass Ejection (CME) over the Ulysses spacecraft on June 9 13, 1993. At this time, the spacecraft was located at 4.6 AU from the sun and at an heliolatitude of 32…
Ulysses High Energy Telescope Elemental Measurements: Secondary to Primary Ratios of Galactic Cosmic Rays
Simpson, J. A.; Thayer, M. R.; Du Vernois, M. A.
The UV Spectrum of the QSO OQ 172 Observed with the Faint Object Spectrograph
Cohen, Ross D.; Junkkarinen, Vesa T.; Lyons, R. W. +2 more
Low resolution far-UV spectra of the high redshift QSO OQ 172 (Z_e_ = 3.544) have been obtained with the prism and the G160L grating of the Faint Object Spectrograph on board the Hubble Space Telescope. Light is detected down to a rest wavelength near 325 A where the spectrum appears to be cut off, possibly by a Lyman limit system. This cutoff is …
Astronomical Archives and Their Importance for Knowledge Transfer in Basic Space Science
Wamsteker, W.; Griffin, R. E. M.
We summarize the nature of modern astronomical archives with special reference to spectroscopic data archives and illustrate in which ways archives can play a role in the accelerated development of Basic Space Sciences in the developing countries. Some of the conflicting issues in the current planning of archives are addressed. Astronomical spectr…