Search Publications
Constraints on the outer atmospheric structure of late-type giants stars with IUE : application to alpha Tau (K5III) and beta Gru (M5III).
Judge, P. G.
Empirical constaints on the outer atmospheric structures of α Tau and β Gru are derived using high resolution spectra from the International Ultraviolet Explorer (IUE) satellite, with methods which have been described and applied to α Boo (K2III) in an earlier paper. These stars have IUE spectra which are typical of giant stars later than ∼K0 whic…
The symbiotic star RR Tel.
Nussbaumer, H.; Hayes, M. A.
The time variability of RR Tel in the stronger ultraviolet emission lines is explored, and a decrease in the UV line fluxes over the 1978-1984 period is noted, while no evidence for correlation with the infrared fluxes is found. There is no evidence for periodic variations in the 1200-3200 A line emission, and the brightness derived from the IUE F…
Mass spectra of heavy ions near comet Halley
Anderson, K. A.; Reme, H.; Korth, A. +10 more
The heavy-ion analyser, RPA2-PICCA, aboard the Giotto spacecraft, detected the first cometary ions at a distance of ~1.05×106 km from the nucleus of comet Halley. In the inner coma the major ions identified are associated with the H2O, CO and CO2 groups. Ions of larger atomic mass unit are also present, correspondi…
Ultraviolet Extinction toward Five Open Clusters, and the Accuracy of IUE Extinction Measurements
Fitzpatrick, E. L.; Massa, D.
The UV extinction curves of 33 main-sequence B stars in five open clusters are presented and analyzed. An analytic fitting function is introduced which represents the observed curves and codifies the structure of the 2175 A extinction bump. A set of extinction parameters are also defined which describe the shape of the far-UV extinction. These dat…
Ultraviolet Variability and Mass Expulsion from R Aquarii
Hollis, J. M.; Kafatos, M.; Michalitsianos, A. G.
Ultraviolet spectra in the 1200-3200 A range indicate that the extended nebular features which resemble a jet in the peculiar variable R Aquarii (M7e + pec) increased in excitation in 1985. The emission properties of the compact H II region that surrounds the unresolved binary, and those of the extended nebular jet, have been analyzed from low-res…
An atlas of high resolution IUE ultraviolet spectra of 14 Wolf-Rayet stars.
Willis, A. J.; van der Hucht, K. A.; Conti, P. S. +1 more
The authors present an atlas of high resolution (Δλ = 0.1 - 0.2 Å) IUE ultraviolet spectra of 14 galactic Wolf-Rayet stars (9 WN and 5 WC). For each star the wavelength ranges covered are λλ1150 - 2050 and λλ1850 - 3250. The spectral data are presented in the form of line identification lists and spectral tracings. Where possible the authors have …
Is CO2 responsible for the outbursts of comet Halley?
Feldman, P. D.; A'Hearn, M. F.; Weaver, H. A. +3 more
Outbursts are thought to originate from the nucleus of comet Halley; cameras on the Vega and Giotto spacecraft have recorded the images of jets1,2, and rapid fluctuations are seen in the visible light curve, detected, for example, by the International Ultraviolet Explorer satellite during the time the spacecraft were making their observ…
A multiwavelength investigation of the supernova remnant IC 443.
White, R.; Dickel, J. R.; Chevalier, R. +3 more
Multiwavelength observations of the supernova remnant IC 443 at radio, infrared, optical, ultraviolet, and X-ray wavelengths are presented. This morphological study of IC 443 presents a detailed picture of an adolescent supernova remnant in a multiphase interstellar medium. Radio observations show that better than 80 percent of the continuum emiss…
Simultaneous X-Ray and Infrared Observations of Cygnus X-3
White, N. E.; Mason, K. O.; Cordova, F. A.
Cygnus X-3 has been observed simultaneously in the X-ray and infrared spectral bands. A series of short flares were detected in the infrared. The most intense of these involve a doubling of the 2.2 micron flux. No counterparts of the flares were unequivocably detected in the X-ray band; the ratio of the flare energy emitted in the 1.5-10.0 keV and…
The Evolution of the 1984 Outburst of the Transient X-Ray Source 4U 1630-47
Stella, L.; Parmar, A. N.; White, N. E.
The results of a series of EXOSAT observations of the X-ray transient 4U 1630 - 47 during an outburst in 1984 are presented. The source decayed over an interval of about 100 days from a maximum 1-50 keV luminosity of about 2.8 x 10 to the 38th to about 4 x 10 to the 36th erg/s (for an assumed distance of 10 kpc). The 1-50 keV spectrum was best rep…