Search Publications

Crowded Field Photometry of M15 Using the TRIFFID Camera

Butler, R. F.; Redfern, R. M.; Shearer, J. A. L.

High-resolution imaging has been performed for a number of years using TRIFFID, the UCG/DIAS High Resolution Camera. Post-exposure image sharpening (PEIS) of TRIFFID data routinely produces resolution improvements up to the theoretical maximum factor of two. HST resolution remains superior but unlike TRIFFID it cannot be used for extended observat…

Cosmic rays in the heliosphere.

Bieber, J. W.

This rapporteur paper covers topics of anomalous cosmic rays, shock acceleration, modulation and transport theory, cosmic-ray gradients, corotating interaction regions, coronal-mass ejections, and solar neutrinos. Among the highlights are: conclusive proof that most anomalous cosmic rays are singly charged, undisputed detection of anomalous cosmic…

Sir Robert Wilson, C.B.E., FRS

Willis, Allan J.; Hartquist, Thomas W.

A model for the accretion disk in the dwarf nova AB Draconis

Li, Zong-yun; Zhu, Ci-sheng; Ding, Yue-rong

A least squares fit to the dwarf nova AB Dra shows that the continuum spectrum predicted by a blackbody accretion disk model can roughly account for the IUE observations during the time of the explosion, while small discrepancies can be attributed to recombination radiation of an optically thin atmosphere and/or blackbody radiation from hot spots.…

The Sun slowly gives up its secrets.

Phillips, K.

A new understanding of the Sun is emerging from the Ulysses and Yohkoh probes.

HIPPARCOS - ein Astrometrie-Satellit der ESA.

Bastian, U.

Die bisherigen Meßdaten des HIPPARCOS lassen sensationelle Ergebnisse erwarten.

Interplanetary magnetic field control of heavy ion abundances at ~ 5.2 AU

Forsyth, R. J.; Lanzerotti, L. J.; Maclennan, C. G.

The HI-SCALE instrument on the Ulysses spacecraft measured a long-lasting heavy ion particle event from about day 304 to day 318, 1992, at a southern heliographic latitude of ~20 deg. An analysis is presented of the relative (to O) C and Fe abundance variations during this interval. The variations are associated with major interplanetary magnetic …

The mass and angular momentum loss from the edge of the accretion disc and the evolution of cataclysmic binaries.

Yu, K. N.; Huang, Runqian

The IUE observations of high excitation P Cygni profiles provide evidence that there is mass outflow in the cataclysmic variables with speed of ≡5000 km/s which can not be driven by the late-type secondary stars. The authors proposed here that these outflows are originated from the outer edge of the accretion disc and give a model for calculation …

Relative astrometry with Hipparcos: double stars with orbital motion.

Badiali, M.; Cardini, D.; Emanuele, A. +2 more

During the Hipparcos data analysis an algorithm was developed to study orbital motion in double stars and to derive the seven Dommanget parameters in the positive cases. Three approaches were followed: linear motion model, quadratic motion model and orbital model. In the last model the algorithm needs sufficiently good starting values and it has b…

Analyses of Wolf-Rayet ultraviolet spectra

Rochowicz, Krzysztof

Ultraviolet spectra of population I WR stars obtained from IUE archive are used to determine fundamental stellar parameters. Terminal velocities for 85 galactic and LMC Wolf-Rayet stars were obtained by means of the empirical relation between spectral quantities easily measured in low resolution and high-resolution terminal velocity measurements. …