Search Publications
The COS-B X-ray observations of X-ray binaries
van der Klis, M.
The observational information on X-ray binaries that was collected with the 80 cm2 auxiliary X-ray detector onboard the COS-B gamma-ray satellite is reviewed. The results illustrate that in the study of X-ray binaries observations of long duration are extremely effective, even when using a small instrument.
Ultraviolet Colors of Old LMC Clusters
Cowley, A. P.; Hartwick, F. D. A.
New ultraviolet spectra for five red LMC globular clusters have been obtained with IUE. These have been supplemented with archival spectra for eleven old LMC clusters. These data strengthen and extend the UV-color vs. age relation for clusters older than 10^9 years, but do not offer much precision in age determination, presumably because the ultra…
Determination of the optical or physical nature of wide visual binaries by means of two-dimensional conditional probabilities
Brosche, P.; Denis-Karafistan, A.; Denis, C.
A sample consisting of 888 wide visual double stars with known relative proper motions has been processed for the HIPPARCOS input catalog. Brosche et al. (1992) applied two separate criteria on this list to discriminate statistically between physical and optical pairs. The first of these criteria uses the number density contrast, the second the ra…
The IUE ultraviolet spectrum of eta CMa.
Sapar, Lili; Sapar, Arved
The results of a study of the high-resolution IUE spectrum of Eta CMa in the range 1,170-3,000 A are outlined. The observed spectrum has the best fit to the model spectrum with Teff = 1,3000 K and log g = 2. Computer recognition and identification of about 1,700 observed spectral features has been carried out. The resonance lines of CII, SiIV, AlI…
Recent Advances in Studies of the Nova Outburst.
Starrfield, S.
Space at JPL.
McLaughlin, W. I.
Contents: Ulysses swings by Jupiter. Radar tracking of asteroids. Lowering mission costs.
Abundances of Classical Novae.
Andreae, J.
A simultaneous X-ray and optical study of TT ARIETIS during its active state - X-ray observations and discussion
Stecklum, B.; Toth, I.; Hudec, R. +25 more
We present results of X-ray observations of TT Ari with the EXOSAT satellite on August 21/22, 1985. This paper represents the second part of the publication of the results obtained with our extended program of optical monitoring and simultaneous optical and X-ray observations of TT Ari. For the first part, which includes optical results, see Wenze…
Giotto rides again.
McDonnell, T.
Giotto has been reactivated and is braced for an encounter with the short-period comet Grigg-Skjellerup.
On zenith-distance variations of the Borowiec astrolabe
Lehmann, M.; Wiktorowski, J.
Systematic differences between zenith distances of two groups of stars observed successively during the same night occur in observations carried out with the Danjon Astrolabe in Borowiec. Four suggestions for the determination of an additional parameter correlated in the best way with the observed variations of zenith distance are made. The best c…